JPH0424066A - Cloth holder removably-fitting device for sewing machine - Google Patents

Abstract

PURPOSE:To enable a cloth holder to be fitted removably and smoothly on a holding leg and to be firmly retained by fitting an engaging pin set saliently on the cloth holder, on the engaging hole of the holding leg, and by fitting an engaged pin inserted through the side wall of the holding leg, on the recessed section of the engaging pin. CONSTITUTION:On a cloth holder 5, an engaging pin 51a is saliently set, and on the engaging pin 51a, a recessed section 52 is formed. Besides, through a holding leg 7, an engaging-pin inserting engaging-hole 73a is bored, and through the side wall of the holding leg 7, a pin inserting hole 74 for penetration to the engaging hole 73a is bored. Through the pin inserting hole 74, an engaged pin 77 with a fitting-on energizing member 78 applied to so that the tip section of the pin 77 may be fitted on the recessed section 52 of the engaging pin 51a is inserted. Besides, on an externally projected section from the holding leg 7 of the engaged pin, a fitting-on releasing member 79 for releasing fitting-on with the fitting-on energizing member 78 is set. As a result, the cloth holder can be smoothly fitted on or removed from the holding leg, and the cloth holder can firmly be retained.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a presser foot attaching/detaching device for a sewing machine.

[Prior Art] Conventionally, as an example of this type of presser foot attaching/detaching device, one disclosed in US Pat. No. 4,763,587 has been proposed.

In this presser foot attaching/detaching device, an engaging pin is provided protruding from the cloth presser, and the engaging pin is formed with a constricted portion.

In addition, the presser foot has an engagement hole for inserting the engagement pin, and the engagement pin is pushed by an elastic member provided inside the engagement hole and engaged with the constriction of the engagement pin. , the presser foot and the presser foot are configured to be fixedly fitted together.

[Problems to be Solved by the Invention] However, in such a presser foot attaching/detaching device, the locking pin is always pushed in the direction of the engagement pin, so the locking pin acts as resistance when attaching and detaching the presser foot. It was not easy to put on and take off.

Although this problem can be solved to some extent by weakening the pressing force of the elastic member, a new problem arises in that the force for holding the presser foot becomes weaker.

The present invention has been made in order to solve the above-mentioned problems, and provides a presser foot attaching/detaching device for a sewing machine that can smoothly attach and detach the presser foot to the presser foot and firmly hold the presser foot. is intended to provide.

[Means for Solving the Problems] In order to achieve this object, in the presser foot attaching/detaching device of the present invention, an engaging pin is provided protruding from the cloth presser foot, and a constricted portion is formed on the engaging pin. , an engagement hole for inserting the engagement pin is formed in the presser foot, and a pin insertion hole passing through to the engagement hole is formed in the side wall of the presser foot,
A locking pin provided with a fitting biasing member is inserted into this pin insertion hole so that the tip end fits into the constriction of the locking pin, and the locking pin is inserted from the presser foot into the pin insertion hole. A fitting release member for releasing the fitting by the fitting biasing member is interposed in the outward protrusion.

[Operation] In the presser foot attaching/detaching device of the present invention having the above-described configuration, the engagement pin provided protrudingly from the presser foot is fitted into the engagement hole of the presser foot. At this time, the locking pin, which is inserted into the pin insertion hole communicating with the engagement hole from the side wall of the presser foot, is fitted or urged into the constriction of the engagement pin by the fitting biasing member, and the presser foot and the presser foot are connected to each other. The fit of the legs is fixed. When the presser foot is attached or detached, the engagement between the locking pin and the constriction is released by the engagement release member.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

A presser arm 6 is provided on the bed surface 1 of the sewing machine so as to be movable relative to the needle 2, which is moved up and down. A pair of first fixing plates 3 and a pair of second fixing plates 4 are respectively screwed at a predetermined distance apart. The second fixing plate 4 is fixed to the center of the pair of first fixing plates 3. Second fixing plate 3
, 4 and the presser arm 6.
A fitting recess 8 for accommodating an elevating body 10, which will be described later, is formed by the distal end surface 61.

Further, on both sides of the presser arm 6, an L-shaped lever 12 is attached to the shaft 1.
3, and one end 121 of each lever 12 is rotatably connected to the tip of the piston mouth/nod 21 of an air cylinder 20 pivotally supported on both sides of the presser arm 6. . On the other hand, the other end 122 of the lever 12 protrudes through an elongated hole (not shown) formed in the distal end surface of the presser arm. Due to the expansion and contraction of the piston rod 21 of the air cylinder 20, the other end 12 of the lever 12
2 is swung in the vertical direction in FIG.

The rectangular plate-shaped elevating body 10 accommodated in the fitting recess 8 is
A connecting hole 101 is formed through the approximately central portion thereof, and the other end 122 of the lever 12 projects through the connecting hole 101. The first part of this elevating body 10. As shown in FIG. 4, on the side faces facing the second fixing plates 3 and 4, a 7-shaped groove 25 is formed parallel to the vertical axis movement line of the needle 2. 1. Elevating body 1 of second fixed plates 3 and 4
■Groove 25 and symmetrical ■Groove 26 on the side facing 0
is formed. Cutout grooves 251 and 261 are formed at the bottoms of these grooves 25 and 26, respectively, along the vertical movement axis of the needle 2. ■ The groove part 25 and the notch groove 251 constitute an elevating body side groove part, and ■ the groove part 26 and the notch groove 2
61 constitutes a side groove portion of the fitting portion.

■ A plurality of steel balls 30 are arranged in series in the space defined by the grooves 25, 26 and the cutout grooves 251, 261, and a retainer 32 that rotatably supports each steel ball 30 is interposed. Each steel ball 30 is surrounded by the grooves 25 and 26.

Further, the retainers 32 are supported by pins 33 at the lower ends of the notched grooves 261, respectively.

A lever 1 is located approximately in the center of the pair of elevating bodies 10 on the operator's side.
A presser foot 7 in which an escape hole 70 is formed through which the other end 122 of the presser foot 7 passes is removably fixed by a screw 71, and a fitting portion 7a formed at the lower end of the presser foot 7 is provided with a presser foot 7. 5 is provided so as to be detachable using an attaching/detaching device which will be described later. As is well known, the presser foot 5 is provided with a needle hole for forming a sewing pattern.

Next, its effect will be explained.

When the air cylinder 20 is operated to press and hold the workpiece W on the bed surface 1, the lever 12 swings in the vertical direction in FIG. As the lever 12 swings up and down, the elevating body 1o is moved up and down while being guided by the steel balls 30 of the retainer 32, and the presser foot 5 is also moved up and down together with the elevating body 10.

Two engaging pins 51a and 51b are provided protruding from the presser foot 5, and a constricted portion 52 is formed in the engaging pin 51a. Further, each engagement pin 51 is provided at the fitting portion 7a of the presser foot 7.
Engagement holes 73a and 73b that engage with the holes 73a and 51b are provided.

A pin insertion hole 74 is provided in the side wall of the fitting portion 7a, and the pin insertion hole 74 penetrates to the engagement hole 73a. The open side of the pin insertion hole 74 is closed by a stop plate 75, and the stop plate 75 has a stopper engagement groove 76 that engages with a stopper 79, which will be described later.

The locking pin 77 is inserted through the pin insertion hole 74, and the tip of the locking pin 77 is configured to engage with the constricted portion 52 due to the elastic force of the spring 78. The locking pin 77 is also provided with a stopper 79, and the stopper 79 engages with the stopper engagement groove 76 when the presser foot 5 is attached to the fitting portion 7a.

Next, the effect will be explained.

When the locking pin 77 is pulled up against the elastic force of the spring 78 and rotated approximately 90'', the stopper 79 is caught on the stopper plate 75, and the engagement between the locking pin 77 and the constricted portion 52 is released (third (See figure).The stopper 79 is shown in figure 4.
The positional relationship between and the stopper engagement groove 76 is illustrated. A solid line indicates a state in which the presser foot 5 is held, and a dotted line indicates a state in which the presser foot 5 is released. In this state, insert the engagement pin 51a into the engagement hole 73.
The presser foot 5 can be removed from the presser foot 7 by pulling it out from a. FIG. 5 shows the state in which the presser foot 5 is removed. still,
The engagement pin 51b is used as a guide pin.

Also, when attaching the presser foot 5 to the presser foot 7, the operation can be done in the reverse order.

As is clear from the detailed description above, in the presser foot attaching/detaching device of the sewing machine of this embodiment, the engagement pin 51a provided protrudingly from the presser foot 5 is inserted into the engagement hole 73a of the presser foot 7. At this time, a pin insertion hole 74 that communicates with the engagement hole 73a from the side wall of the presser foot 7 is formed in the constricted portion 52 of the engagement pin 51a.
The locking pin 77 inserted into the presser foot 7 is urged to be fitted by the spring 78, and the fitting between the presser foot 74 and the presser foot 7 is fixed.
When attaching and detaching the presser foot 5, the stopper 79 is hooked to the stop plate 75 to release the engagement between the locking pin 77 and the constricted portion 52, so the presser foot 5 can be smoothly attached and detached from the presser foot 7, and The presser foot 5 can be firmly held.

Note that the present invention is not limited to the embodiments described above, and modifications can be made without departing from the spirit thereof.

[Effects of the Invention] As is clear from the above detailed description, in the presser foot attaching/detaching device of the present invention, the engagement pin provided protruding from the presser foot is inserted into the engagement hole of the presser foot. At this time, a locking pin inserted into a pin insertion hole communicating with the engagement hole from a side wall of the presser foot is urged to fit into the constriction of the engagement pin by a fitting urging member, The fit between the presser foot and the presser foot is fixed, and when the presser foot is attached or detached, the engagement release member releases the engagement between the locking pin and the constriction, so the presser foot can be smoothly attached and detached from the presser foot. Moreover, it is possible to firmly hold the presser foot.

[Brief explanation of drawings]

1 to 8 show embodiments embodying the present invention. FIG. 1 is a cross-sectional view of the fitting portion between the presser foot and the presser foot, and FIG. 2 is a cross-sectional view of the fitting portion between the presser foot and the presser foot. FIG. 3 is a cross-sectional view of the locking pin and the constriction in a state where the fitting is released, and FIG. 4 is a plan view showing the positional relationship between the stopper and the stopper engagement groove. Fig. 5 is a perspective view with the presser foot removed, Fig. 6 is a front view of the area around the presser foot arm of a sewing machine to which the present invention is applied, Fig. 7 is a sectional view taken along line B-B in Fig. 6, and Fig. 8 is a side view of the area around the presser arm. In the figure, 5 is the cloth presser foot, 7 is the presser foot, 51a is the engagement pin, 5
2 is a constriction, 73a is an engagement hole, 74 is a pin insertion hole, 77 is a locking pin, 78 is a spring, and 79 is a stopper. Patent applicant Brother Industries, Ltd. President Yoshihiro Yasui Figure 3

Claims (1)

[Scope of Claims] 1. In a presser foot attaching/detaching device for a sewing machine for attaching and detaching a presser foot to a presser foot, an engaging pin is provided protruding from the presser foot and a constricted portion is formed on the engaging pin. , the presser foot is provided with an engagement hole through which the engagement pin is inserted, and the side wall of the presser foot is provided with a pin insertion hole that penetrates to the engagement hole; A locking pin provided with a fitting biasing member is inserted so that its tip fits into the constricted portion of the locking pin, and a portion of the locking pin that protrudes outward from the presser foot is inserted. . A presser foot attaching/detaching device for a sewing machine, characterized in that a fitting release member for releasing the fitting by the fitting urging member is interposed.