JPS58192575A - Fabric pressing apparatus of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a presser foot device for a sewing machine having a plurality of presser feet that can be replaced by rotating a presser bar arm.

Conventionally, a presser foot device for a sewing machine in which a rotating body equipped with a plurality of presser feet for different purposes is rotatably provided at the end of a presser bar has been proposed, for example, in Japanese Utility Model Publication No. 55-46138.
However, in this device, a plurality of presser feet are integrally attached to the presser bar via a rotary member, and when the presser bar is raised, all of the plurality of presser feet are raised at the same time. However, the weight of the persimmon presser, which moves up and down at the same time, and the multiple presser feet are large.
The movement also becomes larger. Therefore, it is necessary to increase the presser foot pressure, but when the presser foot pressure is high, the upper fabric is pressed by the presser foot V with a large force, and the lower fabric is fed by 11 degrees, causing fabric shear and However, there was a drawback that the stitch pitch was uneven.

The present invention attempts to solve the above-mentioned conventional drawbacks by eliminating the pushing up operation of the presser foot and allowing only the lower presser bar to be pushed up. ．． 1. An upper presser bar is provided, and when the upper presser bar is pushed against the downward biasing force I, it waits at a position above the upper presser bar, and is fixed to the separately mentioned arm.1. A base guide is attached to the mounting arm, and the base guide rotatably supports a guide having a plurality of vertically oriented engagement grooves. freely? A plurality of upper presser bars are provided which can be engaged with the collar and independently move up and down along the engagement groove by fixing the collar, and the upper presser bars are rotatably held by the base guide υ; The arm of the presser bar arm is supported so that the lower movable arm 1 is biased upwardly, and when the presser bar arm rotates, the above-mentioned toe The upper presser bar located directly below the upper presser bar can be moved up and down independently, and the weight of the other F presser bars is reduced. Since it does not come apart like the conventional method, it moves up and down very quietly and reduces the presser pressure of the cloth presser, so there is no risk of fabric scraping r12 or uneven stitch pitch.1. This is for sewing machines without a presser foot.

As described above, the present invention has the following advantages:1. Tagai!・Since the base is equipped with a presser arm that supports multiple upper presser bars in a rotating single function, when the upper presser bar that is suitable for sewing is positioned directly below the upper presser bar,
The other upper presser bars are held in the standby position at the rear, so they do not interfere with sewing. Also, rotating the presser bar arm makes it easy to change the presser foot.

The presser foot arm can rotate but does not move up and down, so it is placed directly under the upper presser bar during sewing. Only the presser foot moves up and down, the other pressers are stationary, unlike the conventional upper presser. Since the weight of the member that moves up and down is much lighter than in the case where the bar moves up and down integrally with the presser bar arm, the operation is very quiet.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the presser foot device, FIG. 2 is a front sectional view thereof, FIG. 8 is a sectional view taken along line A-A in FIG. 1, and FIG. is 71° B- in Figure 3
It is a sectional view of B. In the figure, (1) is the mounting arm, which is fixed to the arm (2) with the screw (3), and the hole (1a) into which the shaft (4a) integrated with the guide base (4) is inserted.
has. Note that the oil wire in this hole (1a) is even installed at a certain angle that intersects the center line of the presser rod (5).

1) The IJ guide pace (4) has a guy F on the shaft (4a).
f6] is rotatably held, and the mounting arm (1) is identified by holes (not shown) υ, and its upper surface (
4b) and the mounting arm (1) -1 (1b) guide (
6) restricts the movement in the axial direction. Also guide (6)
On opposite sides of the F' presser bar (Hl) (10) #IJ, = Cuff -0Do4) CD retaining protrusion (14a) (14a) is engaged with an engagement groove (6a).
(6;) is set up t'1. ing. Note that although the drawings show a case in which two engaging grooves are provided, three or more such grooves may be provided.

(7) is the presser bar arm, and there are arm parts (711) on opposite sides.
<In addition to providing a candle, fix it with a step screw (8) so that the top surface is in contact with the door surface (4c) of the guide base (1).
l'l, is the screw fixed to the kite base (1)? It is designed to be able to rotate synchronously with the guide (6) around the step screw (8) located at the bottom. The arm part (7a) of the trench presser bar arm (7)
) (7;) has a lower presser bar a++) QO) loosely fitted in it so that it can freely move downward. (11) (11) has a spring attached to the arm (7a) and a bush (7a) in the hole.
91 (which is inserted so as to surround 91 '47) is biased with the above force so as to come into contact with the upper presser bar (5).

(15) is a loose fit 17 on the guide (6), and a spring (
Push the steel ball into the hole (4d) or (4d) of the guide I/base (1) using the screw 07) and the guide (
6), that is, the presser bar arm (acts for force positioning, and when the steel ball (1) and the hole (4d) or (4d) are locked, the upper presser bar (10) or (10) is It is located under the bar (5).The upper presser bar (5) is fixed to the arm (2).

The presser foot (12) (12) is fitted into the bush (18) so as to be slidable up and down, and is mounted by a spring (not shown) to press the presser foot (12) (12) against the throat plate (9), respectively, against the spring (0s01). The force is 1°. Note that the urging force of the spring in the bush 08) and the pressing force due to the weight of the upper presser rod θ0) are larger than the urging force of the spring (tr
, is there.

Next, the operation will be described. When the presser foot lift or knee lift (not shown) is activated, the upper presser bar (5) moves upward against the biasing force of a splinter (not shown).

Therefore, after the pressing force of the upper presser rod (5) is removed, the upper presser rod (IOJ) is raised by the biasing force of the spring 01 in synchronization with the movement of the upper presser rod (5).

Next, while the upper presser bar (5) is waiting above the steel ball (15
) and the hole (4d) of the guide base (4) are released by rotating the presser bar arm (7). At this time, the guy 1 also connects to the presser bar arm (7) via the engagement protrusions (J4a) (14a) of the collars a, u, and i that are engaged with the engagement grooves (6a) (6a'). Rotate synchronously. Furthermore, the presser arm (when you rotate the sword, the steel ball (15) and the kakaite base (4)
), the other hole (4a), H locking 1, in this case the first
Upper presser bar 00 was waiting at the rear as shown in Figures and Figure 2)
3, which is located directly below the upper presser bar (5).

In this case, the amount of upward movement of the upper presser bar (5) is the upper presser cup (1
0) or (10), that is, if it is smaller than the standby position of the upper presser bar at the rear, before the steel ball (15) and the hole (4d) of the guide pace (1) are locked. It is important to push the upper presser bar (10) downward against the spring (11) 1) Also, the amount of upward movement of the upper presser bar (5) is If the maximum upward movement amount is the same as, but smaller or larger than, the above operation is unnecessary. Then, when the operation such as lifting the presser foot is returned to its original state, the biasing force of the spring (not shown) is applied to the upper presser bar (5) and the upper presser bar (5).
10) is lowered until the presser foot (12) comes into contact with the throat plate (19+), and the sewing rate (, iij) is completed. The above operation may be repeated each time.

[Brief explanation of drawings]

1 is a front view of a presser foot device II of a sewing machine showing an embodiment of the present invention, FIG. 2 is a front sectional view of the same, FIG. It is a BB sectional view of FIG. Explanation of the main parts of the diagram ■...Mounting arm 2...Arm 4...Guide base 5...Upper presser bar 6...Guide
6a, 6a... Engagement groove 17... Presser bar arm 7a, 7a... Arm portion 12.1Z... Presser foot 14.14... Collar 1 cow a, 1-4ff
i... Retaining protrusion ♂1- Applicant: Aisin Seiki Co., Ltd.! −=
' , -'J Figure 1 Figure 2

Claims (1)

[Claims] It is arranged on the sewing machine arm so that it can move up and down, and is normally biased downward by a force t17, and is pushed up against the biasing force t17. When the upper presser bar waits at the upper position, the upper presser bar is fixed to the γ-arm, and the guide having a plurality of engagement grooves directed in the vertical direction is rotatably fixed to the mounting arm. The supported base guide is fixed with a collar having an engaging protrusion that is vertically movably engaged with the retaining groove of the guide, and when rotated, it is placed in a standby position directly below and rearward of the upper presser bar. A plurality of moving lower presser bars, attached to each of the lower presser bars.1. biasing the presser foot and lower presser rod upward through the collar and fixing the arm portion that supports the presser foot so as to be movable up and down;
Rotatably held in the base guide1. A presser foot device for a sewing machine 1゜ characterized by consisting of a presser foot bar arm.