JP2008295858A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine in which cloth can be placed flat on a cloth table and which can prevent the deterioration of sewing quality. <P>SOLUTION: The sewing machine includes: the cloth table 2 on which the cloth to be sewn is mounted; an attaching base 4 attached to the cloth table, at a position where the upper end is lower than the upper surface of the cloth table; a presser arm 5 to be freely rotatably coupled to the attaching base; a cloth presser 6 attached to the tip portion of the presser arm to press the cloth mounted on the cloth table from above; a power transmission member 7 arranged under the cloth table so as to transmit power for rotating the presser arm; and a coupling member 8 which is engaged with the power transmission member, fixed to the presser arm, and freely rotatably arranged in the attaching base. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine.

A buttonhole overlock sewing machine that forms a buttonhole overlock by forming a straight or so-called eyelet-shaped cut (button hole) on the cloth to be sewn, and performing a series of overlock stitches around the buttonhole. It is known (for example, refer to Patent Document 1).
As shown in FIG. 7, in order to form a button hole in a cloth, a buttonhole sewing machine has a pair of cloth-cutting knifes and knife receivers, and a cloth placed on the upper surface. A cloth base 101 to be placed, a cloth presser 102 for pressing the cloth onto the upper surface of the cloth base 101, and the like are provided.
The cloth presser device 102 includes a cloth presser 103, a presser arm 104 that supports the cloth presser 103 at one end, and a mounting base 105 that rotatably supports the other end of the presser arm 104. The pressing arm 104 is rotatably provided on the mounting base 105 via a fulcrum shaft 106.

  As shown in FIG. 8, the pressing arm 104 is provided with a transmission member 107 that transmits power to the pressing arm 104 integrally with the pressing arm 104. Here, since the power source of the pressing arm 104 is below the cloth base 101, one end of the transmission member 107 is disposed above the cloth base 101 with the fulcrum shaft 106 to be connected, and the other end is the cloth base. 101 is disposed below. Therefore, the transmission member 107 must penetrate the cloth base 101, and the cloth base 101 is formed with a through hole 108 through which the transmission member 107 penetrates.

Further, as shown in FIG. 9, the cloth presser device has a vertical hole specification in which the presser arm 114 is offset and the cloth C is placed in the longitudinal direction and the hole sewing is performed, unlike the above-described horizontal hole specification. is there.
The cloth presser 112 that presses the cloth against the upper surface of the cloth base 111 includes a cloth presser 113, a presser arm 114 that supports the cloth presser 113 at one end, and an attachment base 115 that rotatably supports the other end of the presser arm 114. And. The pressing arm 114 is rotatably provided on the mounting base 115 via a fulcrum shaft 116.

As shown in FIG. 10, also in the cloth presser device 112 of the vertical hole specification, the presser arm 114 is provided with a transmission member 117 that transmits power to the presser arm 114 integrally with the presser arm 114. Here, since the power source of the pressing arm 114 is below the cloth base 111, one end of the transmission member 117 is disposed above the cloth base 111 with the fulcrum shaft 116 to be connected, and the other end is the cloth base. 111 is arranged below 111. Therefore, the transmission member 117 must pass through the cloth base 111, and the cloth base 111 is formed with a through hole 118 through which the transmission member 117 passes.
JP 2002-306875 A

By the way, as shown in FIG. 7, in the cloth presser device 102 of the horizontal hole specification, the mounting base 105 is provided on the upper surface of the cloth base 101, and the fulcrum shaft 106 is also above the upper surface of the cloth base 101. Therefore, there is a problem that the cloth cannot be placed flat on the upper surface of the cloth base 101.
Further, as shown in FIG. 9, in the cloth presser device 112 of the vertical hole specification, since the mounting base 115 protrudes from the upper surface of the cloth base 111, it is possible to place the cloth flat on the upper surface of the cloth base 111. There was a problem that I could not.
As a result, there is a problem that the quality of the sewing product is deteriorated due to the fact that the cloth cannot be laid flat.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sewing machine that enables a cloth to be placed flat on a cloth table and prevents deterioration of the quality of a sewing product. To do.

  According to the first aspect of the present invention, in the sewing machine, the cloth base on which the cloth to be sewn is placed and the upper end of the cloth base are provided on the cloth base at a position that is the same as or lower than the upper surface of the cloth base. A mounting base; a pressing arm that is rotatably connected to the mounting base; a cloth presser that is provided at a distal end of the pressing arm and presses a cloth placed on the cloth base from above; A power transmission member that transmits power for rotating the pressing arm, and a coupling that is engaged with the power transmission member, fixed to the pressing arm, and rotatably mounted on the mounting base. And a member.

According to the first aspect of the present invention, when power is transmitted to the power transmission member, the power is transmitted to the pressing arm via the connecting member. Since the connecting member is fixed to the presser arm, the presser arm also rotates around the mounting base in conjunction with the movement of the connecting member, and the cloth presser at the tip of the presser arm moves to press the cloth against the base. Or release from such hold down.
Here, since the mounting base is provided on the cloth base at a position where the upper end is the same as or lower than the upper surface of the cloth base, the mounting base does not protrude from the upper surface of the cloth base. Thereby, when placing a cloth on a cloth base, the cloth can be placed flat on the cloth base without being pushed up by the mounting base. Therefore, it is possible to prevent the quality of the sewing product from being lowered due to the floating of the cloth.
Further, since the connecting member is connected to the mounting base, the connecting member also does not protrude from the upper surface of the cloth base, and does not hinder the cloth from being placed flat on the cloth base.
Further, unlike the conventional cloth presser described above, there is no need to form a hole for inserting the connecting member from the upper surface of the cloth base to the lower surface side.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect, the cloth base is supported by a plurality of supports from below, and a feed base for moving the cloth base in a cloth feed direction is provided, and the support is provided. At least one of the bodies is a mounting base support that supports the mounting base from below, and is provided on the mounting base support, and the amount of upward protrusion from the upper end surface of the mounting base support is adjustable. And a height adjustment mechanism.

According to the second aspect of the present invention, the upper surface of the cloth base is generally horizontal so as to have the same height. However, since the mounting base support has the thickness of the mounting base, The position of the upper end is lower than the body, and the height of all the supports cannot be made uniform.
In such a case, in order for each support to evenly support the cloth base, it is necessary to accurately determine the height of the mounting base support, which requires a great deal of work. However, by providing the height adjusting mechanism as in the present invention, even if there is a slight error, the error can be canceled by the height adjusting mechanism.
Therefore, the cloth base can be evenly supported by the support body and the mounting base support body.

According to the first aspect of the present invention, when placing a cloth on the cloth base, the cloth can be placed flat on the cloth base without being pushed up by the mounting base. Therefore, it is possible to prevent the quality of the sewn product from being lowered due to the floating of the cloth.
Further, since the connecting member is connected to the mounting base, the connecting member also does not protrude from the upper surface of the cloth base, and does not hinder the cloth from being placed flat on the cloth base.
Further, unlike the conventional cloth presser described above, there is no need to form a hole for inserting the connecting member from the upper surface of the cloth base to the lower surface side.

  According to the second aspect of the present invention, even if there is a slight error in the dimensions required for the mounting base support, the cloth base is evenly supported by the support and the mounting base support by canceling the error. Can do.

Hereinafter, the best mode of the sewing machine will be described in detail with reference to the drawings.
<Configuration of sewing machine cloth presser>
As shown in FIGS. 1 to 3, the sewing machine 1 has a cloth base 2 on which a cloth to be sewn is placed, and a feed that supports the cloth base 2 from below and moves the cloth base 2 in the cloth feeding direction. A base 3, a mounting base 4 provided on the base 2 at a position where the upper end is lower than the upper surface of the base 2, a pressing arm 5 rotatably connected to the mounting base 4, and a pressing arm 5 As a power transmission member that is provided below the cloth base 2 and that transmits the power for rotating the pressing arm 5. A pressing lever 7 and a connecting member 8 that engages with the pressing lever 7 and is fixed to the pressing arm 5 and rotatably provided on the mounting base 4 are provided.

The cloth base 2 is a plate material disposed on the feed base 3 on a substantially horizontal plane.
The feed table 3 is provided with a plurality of supports 31 on the upper surface thereof for supporting the cloth table 2 from below. At least one support body among the plurality of support bodies 31 is a mounting base support body 32 that supports the mounting base 4 from below. Of the plurality of supports 31, the supports 31 except for the mount support 32 are formed so that the upper surfaces are all at the same height, and a plate 33 is attached to the upper surface of each support 31. A cloth table 2 is arranged on the upper surface of 33.
The mounting base support 32 is formed to be lower than the other supports 31. This takes into account the thickness of the mount 4.
A height adjustment mechanism 9 is provided at the upper end of the mounting base support 32 so that the amount of protrusion upward from the upper end surface of the mounting base support 32 can be adjusted.

As shown in FIG. 2, the height adjusting mechanism 9 is provided at the upper end of the mounting base support 32 and is provided so as to be screwed into the mounting base support 32 and a rod-like body 91 inserted so as to be able to advance and retreat upward. And a set screw 92 for positioning the rod-shaped body 91 on the mounting base support 32 by pressing the rod-shaped body 91 at the tip.
The rod-like body 91 is movably inserted into an insertion hole formed at the upper end of the mounting base support body 32 so as to extend in the vertical direction. A screw hole formed so as to extend in a direction substantially orthogonal to the insertion hole is communicated with the insertion hole, and a set screw 92 is screwed into the screw hole. When the set screw 92 is inserted into the screw hole, the tip of the set screw 92 protrudes into the insertion hole, and the side surface of the rod-shaped body 91 can be pressed against the insertion hole.
Therefore, the amount of protrusion of the rod-shaped body 91 from the upper end of the mounting base support body 32 can be determined depending on the position of the insertion hole in which the rod-shaped body 91 is fixed. At this time, the upper end of the rod-shaped body 91 comes into contact with the mounting base 4. In addition, the upper end surface of the rod-shaped body 91 is formed so as to be substantially along the horizontal plane.

The mounting base 4 is fixed to the cloth base 2 via a set screw 41. The mounting base 4 is formed so that the upper end surface thereof is flush with the upper surface of the cloth base 2 when attached to the cloth base 2. Moreover, when the attachment base 4 is attached to the cloth base 2, it is formed so that the lower end surface may follow a substantially horizontal plane.
The mount 4 is provided with a fulcrum shaft 42 that is rotatable on the mount 4. The pressing arm 5 is connected to the fulcrum shaft 42.

The pressing arm 5 is fixed to the fulcrum shaft 4 and is connected to the base arm 51 extending upward and the upper end of the base arm 51, and extends along the upper surface of the cloth base and is inclined downward in the middle thereof. And a support arm 52 that supports the cloth presser 6.
The cloth presser 6 is connected to the tip of the support arm 52 by a mounting screw 61.
The fulcrum shaft 42 is provided with a connecting member 8 formed integrally with the pressing arm 5 and fixed to the fulcrum shaft 42 so as to be rotatable with respect to the mounting base 4. The connecting member 8 is disposed in a state where the base end is fixed to the fulcrum shaft 42 and is inclined downward toward the distal end. That is, the connecting member 8 is provided so that the entirety thereof is located below the cloth table 2.
Further, as shown in FIG. 3, the mounting base 4 is provided on the cloth base 2 integrally on both sides with the pressing arm 5 and the connecting member 8 interposed therebetween. A collar 44 for preventing the fulcrum shaft 42 from coming off the mounting base 4 is provided outside the one mounting base 4, and this collar 44 is fixed to the fulcrum shaft 42 by a set screw 45. Yes. Further, an E ring 46 is provided on the fulcrum shaft 42 at a position inside the one mounting base 4.

The connecting member 8 has a hook-shaped tip, and a tip on the hook is provided below the cloth table 2 and engaged with a pressing lever 7 to which power for rotating the pressing arm 5 is transmitted. ing. When the drive shaft 71 rotates about its own axis, the lever main body 72 attached to the drive shaft 71 also rotates, and the holding lever 7 engages with the lever main body 72 by the rotation of the lever main body 72. Can be operated.
That is, when the power for moving the pressing arm 5 is transmitted to the pressing lever 7, the connecting member 8 rotates about the fulcrum shaft 42 by driving the pressing lever 7. Since the fulcrum shaft 42 is also rotated by the rotation of the connecting member 8, the pressing arm 5 fixed to the fulcrum shaft 42 is also rotated around the fulcrum shaft 42, and the cloth presser 6 is moved to the cloth base 2 by the rotation of the pressing arm 5. Move up and down.

<Action and effect>
Thus, according to the sewing machine 1, when power is transmitted to the presser lever 7, the power is transmitted to the presser arm 5 through the connecting member 8. Since the connecting member 8 is formed integrally with the holding arm 5, the holding arm 5 also rotates about the fulcrum shaft 42 provided on the mounting base 4 in conjunction with the operation of the connecting member 8, and the tip of the holding arm 5. The cloth presser 6 of the part moves and presses the cloth against the cloth base 2 or releases the presser.
Here, since the mounting base 4 is provided on the cloth base 2 at a position where the upper end is flush with the upper surface of the cloth base 2, the mounting base 4 does not protrude from the upper surface of the cloth base 2. .
As a result, when the cloth is placed on the cloth table 2, the cloth can be placed flat on the cloth table 2 without being pushed up by the mounting table 4. Therefore, it is possible to prevent the quality of the sewn product from being lowered due to the floating of the cloth.
Further, since the connecting member 8 is connected to the fulcrum shaft 42, the connecting member 8 also does not protrude from the upper surface of the cloth table 2, and does not hinder placing the cloth flat on the cloth table 2.
As shown in FIG. 4, when the mounting base 4 is arranged on the upper surface of the cloth base 2, the region R surrounded by the two-dot chain line and the pressing arm 5 can be used as a space for placing the cloth. Although the cloth can be placed flat in this region R, the region where the cloth can be placed on the cloth base 2 of the same size can be enlarged.
Further, as in the cloth presser device (see FIGS. 7 to 8) in the conventional sewing machine described above, a through-hole (through-hole 108 in FIG. 8) for inserting the connecting member 8 from the upper surface to the lower surface side of the cloth table 2 is used. Need to be formed).
Further, as shown in FIG. 3, since the fulcrum shaft 42 is configured to be supported at both ends by the pair of mounting bases 4, the fulcrum shaft 42 can be prevented from being bent or collapsed.

In general, the upper surface of the cloth base 2 is horizontal so as to have the same height. However, since the mounting base support 32 has the thickness of the mounting base 4, the upper end of the base 2 is higher than the other supports 31. A position becomes low and the height of all the support bodies 31 and 32 cannot be made uniform.
In such a case, in order for each support body 31 to support the cloth table 2 evenly, it is necessary to accurately determine the height of the mounting base support body 32, which requires a great deal of work. However, by providing the height adjusting mechanism 9 as in the present invention, the height adjusting mechanism 9 can cancel the error even if there is some error.
Therefore, the cloth table 2 can be evenly supported by the support body 31 and the mounting base support body 32.

<Modification>
In addition, this invention is not restricted to the said embodiment, It is applicable also to the sewing machine provided with the cloth presser of the following vertical hole specifications.
As shown in FIGS. 5 and 6, the sewing machine 200 includes a pair of mounting bases 202 provided on the lower surface of the cloth base 201, a fulcrum shaft 203 rotatably supported by these mounting bases 202, and a fulcrum shaft 203. And a cloth presser 205 attached to the tip of the presser arm 204.
The attachment base 202 is formed so that the upper end thereof is substantially flush with the upper surface of the cloth base 201 when attached to the cloth base 201.
Since the fulcrum shaft 203 is provided on the mounting base 202, the pressing arm 204 is fixed to the fulcrum shaft 203 below the upper surface of the cloth base 201.
The presser arm 204 is integrally formed, and power for driving the presser arm 204 is transmitted to the presser arm 204 via the connecting member 206, and the presser arm 204 rotates about the fulcrum shaft 203. The cloth presser 205 can be operated between a position where it is pressed against the cloth N and a position where it is released.

As described above, also in the sewing machine 200 including the cloth presser device of the vertical hole specification, the mounting base 202 is provided on the cloth base 201 at a position where the upper end is lower than the upper surface of the cloth base 201. The mounting base 202 does not protrude from the upper surface of the.
As a result, when the cloth is placed on the cloth base 201, the cloth can be placed flat on the cloth base 202 without being pushed up by the mounting base 202. Therefore, it is possible to prevent the quality of the sewn product from being lowered due to the floating of the cloth.
Further, as in the cloth presser device (see FIGS. 9 to 10) in the conventional sewing machine described above, a through hole (through hole 118 in FIG. 10) through which the connecting member 206 is inserted from the upper surface of the cloth base 201 to the lower surface side. Need to be formed).

The front view of the cloth pressing device of a sewing machine. The schematic perspective view of a height adjustment mechanism. The side view of the cloth pressing device of a sewing machine. It is a front view of the cloth pressing device of the sewing machine, and is a view showing that the cloth placement area is enlarged. The side view of the cloth presser of a vertical hole specification. The front view of the cloth presser of a vertical hole specification. The front view of the cloth presser of a horizontal hole specification in a prior art. The perspective view of a part of the cloth presser of the horizontal hole specification in the prior art. The front view of the cloth presser of the vertical hole specification in a prior art. The perspective view of a part of the cloth presser of the vertical hole specification in the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Cloth base 3 Feed base 4 Mounting base 5 Presser arm 6 Cloth presser 7 Power transmission member 8 Connecting member 9 Height adjustment mechanism 31 Support body 32 Mounting base support body

Claims (2)

A cloth table on which a cloth to be sewn is placed;
A mounting base provided on the cloth base at a position where the upper end is the same as or lower than the upper surface of the cloth base;
A holding arm rotatably connected to the mounting base;
A cloth presser provided at the tip of the pressing arm and pressing the cloth placed on the cloth base from above;
A power transmission member provided below the cloth base, to which power for rotating the pressing arm is transmitted;
A coupling member that engages with the power transmission member, is fixed to the pressing arm, and is rotatably provided on the mount;
A sewing machine comprising: The cloth table is supported by a plurality of supports from below, and includes a feed table that moves the cloth table in the cloth feeding direction,
At least one of the supports is a mount support that supports the mount from below,
The sewing machine according to claim 1, further comprising a height adjusting mechanism provided on the mounting base support body, wherein a height of an upward protrusion from the upper end surface of the mounting base support body is adjustable.

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