JP4403498B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine in which a needle plate having a needle drop hole is attached to the upper surface of the front end portion of a sewing machine bed via a needle plate holding plate that is separate from or integral with the needle plate. The present invention relates to an attachment structure for detachably attaching a holding plate.

  A sewing cloth is held at the tip of the sewing machine bed between the presser foot suspended from the tip of the sewing machine arm facing the upper part, and a needle that is suspended from the sewing machine arm and moves up and down is attached to the sewing machine. A throat plate having a needle drop hole inserted through the bed is attached. On the other hand, at the tip of the sewing machine bed, where the needle plate is attached, a feed mechanism for applying the feed in the front-rear direction to the sewing fabric on the needle plate, the left-right direction under the needle plate in synchronization with the vertical movement of the needle Many mechanisms necessary for constructing stitches in the sewing fabric, such as a drive mechanism for a looper that moves forward and backward, are incorporated.

  Therefore, the needle plate is attached via a needle plate holding plate that covers the upper surface of the tip of the sewing machine bed over a wide area, and the upper surface of the sewing machine bed is opened over a wide range by removing the needle plate holding plate together with the needle plate. As a possibility, the built-in equipment can be easily inspected, cleaned and adjusted. The needle plate is a part having a high-precision processed portion such as the needle drop hole, a feed dog hole for projecting and retracting a feed dog for adding feed to the sewing fabric, and the needle plate holding plate includes a plurality of models. This is a necessary part to enable sharing of the throat plate, but in some sewing machines with a small-diameter cylindrical bed, the throat plate holding plate and throat plate are integrated and these are machine beds. Attach to the tip of

The needle plate holding plate as described above is generally attached by screwing to the upper surface of the sewing machine bed (see, for example, Patent Document 1). On the other hand, there is a sewing machine that can easily attach and detach the needle plate on the needle plate holding plate in order to cope with a change in the sewing form (for example, see Patent Document 2).
No. 7-52703 No. 7-52704

  However, in the general throat plate holding plate mounting structure disclosed in Patent Document 1, each time the throat plate holding plate is attached / detached for inspection, cleaning and adjustment of the built-in mechanism, There is a problem that tightening operation is necessary and usability is poor.

  On the other hand, in the sewing machine disclosed in Patent Document 2, a needle plate fixing lever that is pivotally attached to the inside of the sewing machine bed is rotated in a horizontal plane so that the needle plate protrudes and retracts from an insertion portion provided on the needle plate. The throat plate can be easily attached and detached, and such an attachment / detachment structure can be adopted as the attachment structure of the throat plate holding plate, but a dedicated stylus plate fixing lever is required. In addition, the number of parts is increased, and in many sewing machines with a narrow inner space of the sewing machine bed, such as the sewing machine having the cylindrical bed described above, it is difficult to secure the attachment position and the rotation space of the needle plate fixing lever. There's a problem.

  The present invention has been made in view of such circumstances, and has a mounting structure with a simple configuration in which a needle plate holding plate that holds the needle plate separately or integrally can be easily attached to and detached from the top surface of the tip of the sewing machine bed. An object of the present invention is to provide a sewing machine that is easy to check, clean, and adjust the built-in mechanism of the sewing machine bed and that can be used conveniently.

The sewing machine according to the first aspect of the present invention is a sewing machine in which a needle plate holding plate for holding the needle plate separately or integrally is detachably attached to the top surface of the tip of the sewing machine bed, the lower surface of the needle plate holding plate. Positioning means for engaging the needle plate holding plate within the upper surface of the sewing machine bed, and a cover plate for opening and closing the front end surface of the sewing machine bed. A part of the needle plate holding plate is pressed from above by closing the cover plate, and the needle plate holding plate is held between the upper surface of the sewing machine bed and restrained so as not to move in the vertical direction. And presser means for carrying out the operation.

In the present invention, placing the needle plate holding plate at the tip top of the bed, leave positioned in the upper plane by the positioning means, closes the cover plate for opening and closing the front end surface of the bed, this The presser means provided on the cover plate is engaged with a part of the needle plate holding plate, and the engaging portion is pressed from above, so that the needle plate holding plate is attached while restraining it from moving up and down. Removing the needle plate holding plate, after releasing the binding on that by the pressing means by opening the cover plate carries a needle plate holding plate lifting upward. The cover plate is for opening the front end surface of the sewing machine bed and providing a large area opening continuous with the upper surface of the sewing machine bed opened by removing the needle plate holding plate. Inspection, cleaning and adjustment of the built-in mechanism Can be facilitated.

  In the sewing machine according to the second invention of the present invention, the positioning means in the first invention includes a positioning pin placed on the lower surface of the needle plate holding plate or the upper surface of the sewing bed, and the upper surface of the sewing bed or the needle plate holding plate. And a pin receiving hole provided so that the positioning pin can be fitted therein.

  In the present invention, the positioning means for positioning the needle plate holding plate on the upper surface of the sewing machine bed is simply constituted by positioning pins that are driven on one of the mating surfaces of the both and a pin receiving hole that is provided on the other side. Then, by positioning the positioning pin in the pin receiving hole, the positioning can be performed with high accuracy within the upper surface of the sewing machine bed.

A sewing machine according to a third invention of the present invention is characterized in that the presser means in the first invention or the second invention is a leaf spring having elasticity in the vertical direction.

In the present invention, the pressing means a plate Banetoshi provided on the cover plate, thereby reliably performed the engagement of the portion of the needle plate holding plate during closure of the cover plate with the vertical direction of the elastic deformation, pressing means The processing and assembly accuracy required to realize the pressing of the engaging portion by the above is eased.

In the sewing machine according to the first aspect of the present invention, the needle plate holding plate for holding the needle plate is positioned in the upper surface of the sewing machine bed, the lid plate for opening and closing the front end surface of the sewing machine bed is closed, and the lid The presser means provided on the plate is engaged with a part of the needle plate holding plate, and the needle plate holding plate is attached by pressing the engaging part from above , making it easy to attach and detach the needle plate holding plate without using dedicated parts. This makes it easy to check, clean and adjust the built-in mechanism of the sewing machine bed, and can improve usability.

  In the sewing machines according to the second and third inventions, the positioning of the needle plate holding plate within the upper surface of the sewing machine bed and the restraining in the vertical direction can be reliably realized with a simple configuration. Has an excellent effect.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. 1 and 2 are perspective views of the sewing machine according to the present invention in the vicinity of the tip of the sewing machine bed. FIG. 1 shows a state in which the needle plate holding plate is removed, and FIG. 2 shows that the needle plate holding plate is attached. Each state is shown.

  In the figure, 1 is a sewing machine bed. The sewing machine bed 1 shown in this figure has a cylindrical shape that allows the sewing product to be inserted in order to enable the sewing of a cylindrical sewing product, such as the body and sleeves of various clothing items. It is configured as a bed. As shown in FIG. 1, a rectangular opening 10 communicating with the inside cavity is formed on the upper surface of the tip of the sewing machine bed 1 over substantially the entire width. As shown in FIG. The needle plate holding plate 2 is attached so as to be closed from above. Note that built-in mechanisms such as a feed mechanism and a looper mechanism are disposed in the inner cavity of the sewing machine bed 1, but these built-in mechanisms are not shown in FIGS. 1 and 2.

  Pin receiving holes 12 and 12 having a predetermined diameter are formed in side edges 11 and 11 that border both sides of the opening 10 in the width direction. The opening 10 extends to the front end surface of the sewing machine bed 1 and is continuous with the front end opening sealed by the end plate 13. The end plate 13 is parallel to the upper surface of the sewing machine bed 1. The lower edge is pivotally supported by the pivot 30, and the cover plate 3 is attached so that it can be opened and closed by turning around the pivot 30.

  The upper part of the lid plate 3 is bent at a substantially right angle, and when in the closed state shown in FIG. 2, a bent part 31 extending toward the base end along the upper surface of the sewing machine bed 1 is provided continuously. The plate 3 can be rotated around the pivot 30 by placing a finger on the concave portion 32 provided on the outer surface of the bent portion 31 and pulling it forward. As shown in FIG. 1, a part of the opening of the tip of the sewing machine bed 1 sealed by the end plate 13 is opened continuously with the opening 10 on the upper surface.

  As shown in FIG. 1 with a part broken away, an engagement piece 33 is attached to the inner surface of the cover plate 3 at a substantially central portion in the width direction near the upper edge. This engagement piece 33 is a leaf spring bent into an L-shape, and is screwed along one side to the inner surface of the cover plate 3 so that the other side is in the same direction as the bent portion at the top of the cover plate 3. It protrudes with a downward slope and is fixed so as to have elasticity in the vertical direction.

  The needle plate holding plate 2 is configured by connecting support edges 20 and 20 on both sides in the width direction with a receiving plate 21 installed between the two, and a needle fixed to the upper side of the receiving plate 21 with screws. The plate 4 is held so as to be substantially flush with the upper surfaces of the support edges 20 and 20. As shown in FIG. 2, such a needle plate holding plate 2 has supporting edges 20 and 20 on both sides placed on both side edges 11 and 11 of the opening 10, and the upper surface of the needle plate 4 is the sewing machine bed 1. It is attached so that it may be flush with the upper surface.

  As shown in FIG. 1, the lower surfaces of the support edges 20 and 20 of the throat plate holding plate 2 can be fitted into the pin receiving holes 12 and 12 formed in the side edges 11 and 11 on which they are placed, respectively. Positioning pins 22 and 22 having different diameters are provided, and a throat plate holding plate 2 placed on the sewing machine bed 1 is connected to the pin receiving holes 12 and 12 as shown by a two-dot chain line in FIG. By positioning the positioning pins 22, 22, the sewing machine bed 1 is positioned so as not to move left and right and back and forth within the upper surface of the sewing machine bed 1.

  Further, on the upper surface on the other side of the receiving plate 21 of the needle plate holding plate 2, there is provided an engaging recess 23 that is recessed downward at a substantially central portion in the width direction. This engagement recess 23 is located in the vicinity of the front end opening of the sewing machine bed 1 closed by the end plate 13 when the needle plate holding plate 2 is placed on the sewing machine bed 1 as shown by a two-dot chain line in FIG. When the lid plate 3 positioned and attached to the end plate 13 so as to be freely opened and closed is closed as shown in FIG. 2, the engagement plate 33 is engaged with the engagement piece 33 on the inner surface of the lid plate 3, and the needle plate holding plate 2 is moved. Acts to restrain the movement up and down.

  FIG. 3 is an explanatory view of the engagement state of the engagement piece 33 of the lid plate 3 and the engagement recess 23 of the needle plate holding plate 2, and FIG. 3A shows a state in which the lid plate 3 is closed. However, FIG. 3B shows a state in which the cover plate 3 is opened. In these drawings, the illustration of the built-in device of the sewing machine bed 1 is omitted.

  When the cover plate 3 is in a closed state, the engagement piece 33 attached to the inner surface of the cover plate 3 is a needle plate holding plate placed on the sewing machine bed 1 as shown in FIG. 2 is in contact with the upper surface of the engaging recess 23. Here, the engagement piece 33 is a leaf spring having elasticity in the vertical direction as described above, and the contact with the engagement recess 23 can be caused by elastic deformation of the engagement piece 33. As a result, the needle plate holding plate 2 is pressed downward by the elastic restoring force of the engagement piece 33 acting on the engagement recess 23 as shown by white arrows in the figure, and constitutes the upper surface of the sewing machine bed 1. It will be pressed against the side edges 11, 11 of the opening 10, and the movement of the needle plate holding plate 2 in the vertical direction can be reliably restrained. The needle plate holding plate 2 and the needle plate 4 are connected to the positioning pin 22 , 22 and the pin receiving holes 12, 12 are fixed in a non-movable manner in all directions by a synergistic action with the movement restraint in the upper surface of the sewing machine bed 1.

  On the other hand, when the cover plate 3 is opened as shown in FIG. 3B, the engagement piece 33 on the inner surface of the cover plate 3 is disengaged from the engagement recess 23 provided in the needle plate holding plate 2 to hold the needle plate. The upper and lower restraints of the plate 2 are released. As a result, the needle plate holding plate 2 and the needle plate 4 can be lifted upward as indicated by white arrows in the figure, and by this lifting, the positioning pins 22, 22 and the pin receiving holes 12, 12 are fitted. After disconnecting, the needle plate holding plate 2 can be removed in an appropriate direction.

  Also, as shown by the arrows in FIG. 3B, when the cover plate 3 is turned to close. The bent end of the engagement piece 33 attached to the inner surface of the cover plate 3 rides on the engagement recess 23, and the fixed state of the needle plate holding plate 2 shown in FIG. At this time, since the engagement piece 33 is a leaf spring, the climbing onto the engagement recess 23 is ensured with the elastic deformation of the engagement piece 33, and the engagement between the engagement piece 33 and the engagement recess 23 is ensured. The restriction in the vertical direction of the needle plate holding plate 2 by the combination is firmly realized.

  Thus, in the sewing machine according to the present invention, the needle plate holding plate 2 fixed on the sewing machine bed 1 is simply opened by opening the lid plate 3 at the tip of the sewing machine bed 1 and then pulling the needle plate holding plate 2 upward. The needle plate holding plate 2 can be mounted on the sewing machine bed 1 and can be fixed by a simple procedure of closing the lid plate 3 at the tip of the sewing machine bed 1. It is possible to easily check, clean, and adjust mechanisms built in the tip of the sewing machine bed 1 such as a mechanism and a looper driving mechanism. Further, by opening the cover plate 3, an opening continuous with the opening 10 on the upper surface is formed at the tip of the sewing machine bed 1 as shown in FIG. 1, so that the inspection, cleaning and adjustment are further facilitated. .

  In the process of removing the needle plate holding plate 2 described above, when the needle plate holding plate 2 is pulled upward, there is a possibility of interference with a presser foot and a needle (not shown) located above the needle plate 4 in actuality. The needle plate holding plate 2 is pulled up within a range that does not interfere with the presser foot and the needle, and the positioning pins 22, 22 and the pin receiving holes 12, 12 are disengaged. It is done by the procedure of pulling out. Consideration for interference with the presser foot and the needle is also necessary when attaching the throat plate holding plate 2.

  FIG. 4 is a perspective view of the vicinity of the tip of the sewing machine bed showing another embodiment of the sewing machine according to the present invention. In this embodiment, pin receiving holes 12, 12 provided on both side edges 11, 11 of the opening 10 on the upper surface of the sewing machine bed 1 extend toward the tip of the sewing machine bed 1, and the end face of the end plate 13 It is as a long hole opening in The configuration of the other parts is the same as the actual form shown in FIG. 1, and the same reference numerals as those in FIG.

  In the sewing machine shown in FIG. 4, the needle plate holding plate 2 is positioned at the tip of the sewing machine bed 1 and, as indicated by arrows in the figure, positioning pins 22, 22 is inserted into the pin receiving holes 12 and 12 from the opening on the end plate 13 side and is slid along the both side edges 11 and 11 of the opening 10 to be positioned at a predetermined position. Thereafter, the lid plate 3 is closed. It can be fixed. Further, the detachment of the throat plate holding plate 2 can be realized by the procedure of sliding the throat plate holding plate 2 to the tip side along the side edges 11 and 11 of the opening 10 after opening the cover plate 3. When attaching / detaching the throat plate holding plate 2, the above-described consideration for interference with the presser foot and the needle becomes unnecessary.

It is a perspective view of the sewing machine bed vicinity vicinity of the sewing machine concerning the present invention. It is a perspective view of the sewing machine bed vicinity vicinity of the sewing machine concerning the present invention. It is explanatory drawing of the engagement state of the engagement piece of a cover plate, and the engagement recessed part of a throat plate holding | maintenance board. It is a perspective view of the sewing machine bed tip vicinity which shows other embodiment of the sewing machine which concerns on this invention.

Explanation of symbols

1 Sewing machine bed 2 Needle plate holding plate 3 Cover plate 4 Needle plate
12 pin receiving hole
22 Positioning pin
23 Engaging recess
33 Engagement piece

Claims (3)

In the sewing machine in which the needle plate holding plate for holding the needle plate separately or integrally is detachably attached to the top surface of the tip of the sewing machine bed,
Positioning means for engaging each other between the lower surface of the needle plate holding plate and the upper surface of the sewing bed, and positioning the needle plate holding plate within the upper surface of the sewing bed,
Wherein is provided with a front end surface of the bed to the cover plate covering openably, pressing a portion of the needle plate holding plate by closure of the lid plate from above, the upper surface of the sewing machine bed needle plate holding plate A sewing machine comprising a presser means that is held in between and restrained so as not to move in the vertical direction.   The positioning means is provided so that the positioning pins can be fitted on the upper surface of the sewing bed or the lower surface of the needle plate holding plate, and the positioning pins placed on the lower surface of the needle plate holding plate or the upper surface of the sewing machine bed. The sewing machine according to claim 1, further comprising a pin receiving hole. The sewing machine according to claim 1 or 2, wherein the presser means is a leaf spring having elasticity in the vertical direction.

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