JP4273034B2 - Sewing machine with buttons - Google Patents

Description

  The present invention relates to a sewing machine with a button.

Conventionally, as a button sewing machine that sews buttons to the fabric, for example, a first button sewing that sews buttons to the fabric by rake sewing or root winding sewing and a second button sewing that sews normal buttons. What was comprised so that execution was possible is known (for example, refer patent document 1). Of these, when the first button sewing is performed, the cloth to which the button is sewn is bent and held by the holding portion at the tip of the tongue, and the held cloth is pressed and held from above by the cloth presser. It has become.
In addition, since the second button sewing is performed by placing buttons and cloth on the sewing bed and performing button attachment, button attachment is performed without using a tongue.
JP 2002-355453 A

  However, when performing the second button sewing, the cloth presser is positioned on the cloth conveyance path up to the button sewing position, and it is necessary to set the cloth so as to straddle the cloth presser. The workability is getting worse.

  An object of the present invention is to provide a button sewing machine capable of appropriately performing a set of fabrics on which buttons are sewn without obstructing a cloth presser, and thereby performing button sewing work efficiently. That is.

In order to solve the above-mentioned problem, the invention described in claim 1
A holding portion for holding the fabric bent at the tip, and a tongue supported rotatably at a holding position where the fabric is placed in the vertical movement path of the needle and a release position where the cloth is separated from the vertical movement path A button sewing machine that uses a first button sewing to sew a button to the fabric and a second button sewing to sew a button to the fabric without using the tongue;
It is configured to be movable up and down between an operating position that contacts the tongue in the holding position via the fabric and a standby position above the tongue at the time of the first button sewing, and the tongue is held in the operating position. A cloth presser that presses and holds the fabric held in the section,
The cloth presser is configured to be able to descend to a retracted position below the tongue holding portion at the holding position in conjunction with the movement of the tongue to the release position at the time of the second button sewing.
The second button is sewn down to the retracted position at the time of sewing with a button.

According to the first aspect of the present invention, the cloth presser that holds the cloth held by the tongue holding portion from the upper side in the first button-sewing is pressed from the upper side of the cloth. Since the cloth can be lowered to the retracted position below the tongue at the holding position for holding, the cloth can be set properly without the cloth presser getting in the way. Therefore, the workability of the second button sewing can be improved and the button sewing work can be performed efficiently.

The invention according to claim 2 is the button sewing machine according to claim 1,
Cloth pressing drive means for applying a driving force for vertical movement to the cloth pressing;
Tongue driving means for applying a driving force for moving the tongue between the holding position and the release position;
The cloth retainer is moved so that the tongue is moved to the release position and the cloth retainer is lowered to the retracted position in conjunction with the movement of the tongue to the release position when performing the second button sewing. Drive means and control means for controlling the tongue drive means.

According to the second aspect of the present invention, it is possible to obtain the same effect as the first aspect of the invention. In particular, when the second button sewing is performed, the tongue is moved to the release position. In addition, the cloth presser is moved to a position that does not interfere with the cloth set by lowering the cloth presser to the retracted position below the tongue at the holding position in conjunction with the movement of the tongue to the release position. The burden of artificial work can be reduced.

  According to the first aspect of the invention, when performing the second button sewing, it is possible to appropriately set the fabric without the cloth presser getting in the way. Therefore, the workability of the second button sewing can be improved and the button sewing work can be performed efficiently.

  According to the second aspect of the present invention, it is possible to reduce an artificial work load for moving the cloth presser to a position that does not interfere with the setting of the cloth.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

The sewing machine with a button according to the present invention sews a button on a cloth by the cooperation of a sewing needle that moves up and down and a looper (not shown), and a bed part (sewing machine bed part) having a looper built in a tip part thereof, It has a vertical trunk (not shown) standing from the rear end of the bed, and an arm (not shown) that extends from the upper part of the vertical trunk almost parallel to the bed and supports the sewing needle. The outer shape is substantially U-shaped.
In the following description, the vertical movement direction of the sewing needle is defined as the Z-axis direction, and the direction perpendicular to the direction and the longitudinal direction of the bed portion and the arm portion is defined as the Y-axis direction. The direction orthogonal to both axial directions is taken as the X-axis direction. In each of these axial directions, the direction indicated by the arrow is the positive direction, and the opposite direction is the negative direction.

FIG. 1 is a perspective view showing a buttoned sewing machine 100 exemplified as an embodiment to which the present invention is applied.
A button-attached sewing machine 100 shown in FIG. 1 sewes a button B (see FIG. 3) held by a button holding unit 1 to a fabric C by using a sewing needle N that moves up and down by a needle up-and-down moving mechanism (not shown). The first button sewing and the second button sewing to be worn are performed under the control of the control unit 5 (see FIG. 4).

  The sewing needle N is held at the lower end of a needle bar (not shown) that can reciprocate along the longitudinal direction (Z-axis direction) based on driving of the sewing machine motor 6 (see FIG. 4). The sewing needle N is configured to be reciprocally swingable in the X-axis direction via a predetermined needle swing mechanism (not shown) by driving a needle swing motor (not shown) under the control of the controller 5. Has been.

The button holding unit 1 is configured to hold the button B above the bed unit 2, move and position the button B in each direction of the X, Y, and Z axes and variably adjust the posture of the button B. .
That is, one end of the button holding portion 1 is supported by the arm portion, and each of a pair of button holding members 12 and 12 (see FIG. 3) that sandwich the button B from both sides along the X-axis direction is fixed to the other end. Two button holding arms 11 and 11 are provided, and the button B is moved to an arbitrary position on the XY plane by moving the button holding arm 11 through a predetermined driving mechanism by driving a driving unit (not shown). It is configured to be able to move and position and adjust the height in the Z-axis direction.
Further, the button holding member 12 can be adjusted in angle by rotating around the axis in the X-axis direction. Thus, the angle can be adjusted by rotating the button B held by the pair of button holding members 12 and 12 around the axis in the X-axis direction to change the posture. The angle adjustment function of the button B is used when performing a series of operations from rake sewing to root winding sewing, which is sewing (described later) that does not use a force button. In other words, the button B held by the button holding member 12 is maintained in a state along the XY plane at the time of rake sewing, and maintained at a state rotated by 90 ° at the time of root winding sewing.

Next, the structure of the bed part 2 which concerns on operation | movement of the 1st button sewing and the 2nd button sewing is demonstrated.
The first button sewing is an operation in which the button B held by the button holding unit 1 is sewn by scooping or root winding sewing (described later), and the second button sewing is a button B. This is an operation of sewing by sewing (described later) or using a force button.

  On the vertical trunk portion side of the bed portion 2, a lower plate 41 on which a cloth C on which the button B is to be sewn on the needle plate 40 is placed, and a second cloth C that is placed on the lower plate 41 is held. And a force button holding portion 43 for holding a force button attached to the back side of the cloth C with respect to the button B.

The lower plate 41 is disposed on the upper surface of the bed portion 2 and in the vicinity below the sewing needle N arranged at a predetermined sewing position. In addition, the fabric C is placed on the upper surface of the lower plate 41 when performing solid stitching.
The solid stitching is performed without using the tongue 31 described later, and the button B is arranged on the lower plate 41 so as to extend along the surface of the fabric C that is spread substantially perpendicularly to the sewing needle N. In this state, the sewing is performed by the sewing needle N and the sewing thread being pierced from above to the back surface of the fabric C (see FIG. 8).

  The second cloth presser 42 is disposed above the lower plate 41 and is supported so as to move up and down. The second cloth presser 42 is pressed against the cloth C placed on the lower plate 41 from above to hold the cloth C. Is for doing.

The force button holding portion 43 is provided below the placement surface of the fabric C on the lower plate 41, and includes a claw that pressurizes and holds the force button from three directions on the outer periphery thereof. It is held in a state along the placement surface of the plate 41 (a state where the button hole H of the force button is along the Z-axis direction).
Further, the force button holding portion 43 allows the sewing needle N to be inserted below the lower plate 41 through a gap provided between the claws when the force button is not held.
The force button is a button that is sewn together with the normal button B (front (up) button) on the back side of the fabric C when button sewing is performed, and is used only for sewing the normal button B. Unlike the normal button B, it does not have a function of fastening the open part of the clothes. Such a force button may have a size that is not different from that of the normal button B, but generally a button that is smaller than the normal button B is often used.

Next, the configuration of the bed portion 2 related to the operation of the first button sewing will be described with reference to the drawings.
Here, FIG. 2 is a perspective view showing the first cloth presser 33 and the cloth presser moving mechanism part 35 provided in the bed part 2.
As shown in FIG. 1 and FIG. 2, a tongue 31 that holds a fabric C, a support plate 32 that supports the tongue 31 from below at a holding position (described later), A first cloth presser 33 for pressing and holding the fabric C held by the tongue 31 from above the tongue 31, a tongue moving mechanism 34 for rotating the tongue 31 about the axis in the X-axis direction, and the first cloth A cloth presser moving mechanism unit 35 that moves the presser 33 up and down is provided.

The tongue 31 is a member formed in an arm shape, and a base end portion thereof is supported by a lower end portion on the distal end side of the bed portion 2 so as to be rotatable around an axis in the X-axis direction.
Further, a holding portion 31a for bending and holding the fabric C to which the button B is sewn at the time of rake sewing is provided at the tip of the tongue 31. The holding portion 31a extends along the Y-axis direction, is formed in a substantially flat plate shape, and is formed in a substantially wedge shape whose thickness decreases toward the tip portion. And the holding | maintenance part 31a is set so that the flat plate surface may be in the state along XY plane in the holding position.

The tongue moving mechanism part 34 is provided on the positive X-axis direction side of the frame 21 disposed along the bed part 2, and has a tongue cylinder 342 that advances and retracts the output rod 341 to drive the tongue 31, and one end part thereof The output rod 341 includes a tongue link 343 that is attached to one end portion of the output rod 341 so as to be rotatable around an axis in the X-axis direction, and the other end portion is fixed to a proximal end portion on the rotation center side of the tongue 31.
The tongue moving mechanism unit 34 can switch the position of the tongue 31 between the holding position of the fabric C and the release position of the holding by driving the tongue cylinder 342 under the control of the control unit 5. . Specifically, the cloth C is positioned on the vertical movement path of the sewing needle N by rotating the tongue 31 around the axis in the X-axis direction via the tongue link 343 by the advancement and retreat of the output rod 341. The position of the holding portion 31a of the tongue 31 can be switched between a holding position (see FIG. 1) and a release position (see FIGS. 6 and 7) that releases the holding of the fabric C while being separated from the vertical movement path of the sewing needle N. It has become.
Here, the tongue cylinder 342 constitutes a tongue driving means for applying a driving force for moving the tongue 31 to the holding position and the releasing position of the fabric C.

  Note that, based on the manual operation of the operator, when a predetermined movement of the tongue 31 located at the release position toward the holding position is detected by a predetermined sensor, the tongue is controlled under the control of the control unit 5. The holding portion 31a can be automatically set to be positioned below the sewing needle N by driving the cylinder 342.

  As shown in FIG. 2, the first cloth presser 33 includes a Y-axis extending portion 331 that extends in the substantially Y-axis direction along the negative X-axis direction surface of the frame 21, and a Y-axis extending configuration. From the end on the positive Y-axis direction side of the portion 331, a Z-axis extending portion 332 extending in the substantially Z-axis direction so as to be substantially perpendicular to the frame 21, and from the upper end of the Z-axis extending portion 332 While extending in the positive Y-axis direction so as to be substantially parallel to the upper surface of the bed portion 2, the tip end portion is located on the positive X-axis direction side until it substantially overlaps the central portion of the holding portion 31 a of the tongue 31. A curved extending portion 333 that is curved, and extends substantially perpendicularly to the upper surface of the bed portion 2 from the distal end portion of the curved extending portion 333 and contacts the upper surface of the fabric C that is bent by the holding portion 31a of the tongue 31. And an abutting portion 334 in contact therewith.

The Y-axis extending portion 331 is formed around a shaft center in the X-axis direction by, for example, a stepped screw 21c pivotally supported by the frame 21 being screwed into a screw hole formed at the end on the negative Y-axis direction side. It is rotatably supported by.
A guide hole 335 is formed on the Z-axis extending portion 332 side of the Y-axis extending portion 331 so as to guide the rotation of the Y-axis extending portion 331 and restrict the rotating operation. A guide shaft 21a provided in the frame 21 is inserted into the hole 335, and the first cloth presser 33 is prevented from coming off by a retaining member 21b such as a nut. Specifically, the guide hole 335 is formed in, for example, an oval shape along the Z-axis direction, and the rotation distance of the first cloth presser 33 is defined according to the length. .
Further, a cloth presser link 353 of a cloth presser moving mechanism part 35 described later is connected to the Z-axis extended part 332 side further than the guide hole 335 of the Y-axis extended part 331.

  The curved extending portion 333 extends in the positive Y-axis direction from the tip of the bed portion 2, and when the tongue 31 is retracted to the retracted position, the tongue 31 and the upper surface of the bed portion 2 in the holding position. It is possible to move below the height.

The cloth presser moving mechanism section 35 includes a cloth presser cylinder 352 (cloth presser driving means) for moving the output rod 351 forward and backward for applying a driving force for vertical movement to the first cloth presser 33, and one end portion of the output rod 351. A cloth presser link 353 is attached to one end and the other end is attached to the Y-axis extending portion 331.
The cloth presser moving mechanism unit 35 is controlled by the control unit 5 so that the cloth presser cylinder 352 is driven and the output rod 351 is advanced and retracted, whereby the Y-axis extending part 331 is moved in the negative Y-axis direction side. The first cloth presser 33 can be rotated around the axis in the X-axis direction with the end of the axis as the axis. Specifically, when the cloth presser cylinder 352 is driven to push out the output rod 351, the first cloth presser 33 is rotated so as to move in the positive Z-axis direction, and the curved extension portion The abutting portion 334 of 333 can be positioned above the holding portion 31a (see FIG. 5). At this time, for example, the guide shaft 21a abuts on the lower inner surface of the guide hole 335, whereby the first The rotation operation of the cloth presser 33 is stopped. In this way, the first cloth presser 33 can be moved to the standby position above the tongue 31.
Further, when the cloth presser cylinder 352 is driven so as to pull in the output rod 351, the first cloth presser 33 is rotated so as to move in the negative Z-axis direction, and the holding portion 31a disposed at the holding position. (See FIGS. 7 and 8). At this time, for example, when the guide shaft 21a contacts the upper inner surface of the guide hole 335, the first cloth presser 33 rotates. The operation is stopped. In this way, the first cloth presser 33 can be moved to the retracted position below the tongue 31 in the holding position.
Here, the movement of the first cloth presser 33 in the Z-axis direction is restricted by the tongue 31 when the tongue 31 is disposed at the holding position. That is, in a state where the tongue 31 bent from the fabric C is disposed at the holding position, when the first cloth presser 33 positioned above the holding portion 31a of the tongue 31 is moved in the negative Z-axis direction, The movement comes into contact with the upper surface of the fabric C bent by the holding portion 31a, and the movement is stopped. In this way, the first cloth presser 33 can be moved to the working position where the first cloth presser 33 comes into contact with the tongue 31 in the holding position via the cloth C during the first button sewing. The first cloth presser 33 is pressed from above.

Among the above configurations, the lower plate 41, the second cloth presser 42, the force button holding portion 43, the tongue 31, the support plate 32, the first cloth presser 33, the tongue moving mechanism portion 34, and the cloth presser moving mechanism portion 35 are Together, it is possible to move and position together with the frame 21 in the Y-axis direction according to the driving of the lower Y feed motor 8 (not shown) of the lower Y feed motor 8.
That is, below the sewing needle N, the sewing position (see FIG. 8) by the second button sewing that positions the lower plate 41 and the force button holding portion 43, and the holding portion 31a and the support plate 32 of the tongue 31 are positioned. It is possible to switch to the sewing position by the first button sewing.

Next, with reference to FIG. 3, the sewing procedure of the button B by the first button sewing will be described.
Here, FIG. 3 is a diagram for explaining the sewing procedure of the button B, FIG. 3 (a) is a plan view showing a state during rake sewing, and FIG. 3 (b) is a diagram during rake sewing. It is a side view which shows a state, FIG.3 (c) is a top view which shows the state at the time of root winding sewing.

First, as shown in FIGS. 3 (a) and 3 (b), the fabric C bent and held by the holding portion 31a of the tongue 31 is supported by the support plate 32 from below, and the first cloth presser from above. In a state where the button B is pressed and held, the button B is held in a horizontal state by the pair of button holding members 12 so that the button B and the button attachment portion which is a bent portion of the fabric C are opposed to each other. Then, the sewing needle N is lowered into one button hole H so as to pass the thread so that the bent portion does not penetrate to the back surface of the fabric C. Thereafter, the sewing needle N rises, but when the sewing needle N is positioned above one button hole H, the tongue 31 and the button holding portion 1 are set in a predetermined direction so that the other button hole H and the sewing needle N are opposed to each other. Move away. Then, the sewing needle N descends again, but at this time, the thread passes through the other button hole H.
By repeating this operation, so-called rake sewing is performed in which the button B is attached with a gap between the fabric C and the button B.

  When the rake sewing is completed, the button holding member 12 is switched to the vertical state while holding the button B, as shown in FIG. Thereafter, the tongue 31 and the button holding unit 1 are integrally moved in the horizontal direction at a predetermined timing based on the vertical position of the sewing needle N, and the sewing needles are formed on both sides of the thread stretched between the button B and the fabric C. N is lowered alternately, and the thread is sewed around the neck. Buttoning is completed by the above operation.

Next, the control unit 5 will be described with reference to FIG.
Here, FIG. 4 is a block diagram showing a main configuration of the button sewing machine 100.
As shown in FIG. 4, the control unit 5 includes a CPU (Central Processing Unit) 51, a RAM (Random Access Memory) 52, a ROM (Read Only Memory) 53, an interface (I / F) 54, a drive circuit 55, a tongue cylinder. The driving circuit 56, the cloth presser cylinder driving circuit 57, the lower Y feed motor driving circuit 58, and the like.

  A drive circuit 55, a tongue cylinder drive circuit 56, a cloth presser cylinder drive circuit 57, a lower Y feed motor drive circuit 58, and the operation panel 7 are electrically connected to the interface 54.

  The drive circuit 55 is connected to the sewing machine motor 6 and controls the drive of the sewing machine motor 6 based on the drive signal output from the CPU 51 and input through the interface 54 as a result of the arithmetic processing of the CPU 51. As a result, the sewing motor 6 is driven and the sewing needle N moves up and down or the looper rotates in a predetermined direction to form the stitches, whereby the button B can be sewn.

  The tongue cylinder driving circuit 56 is connected to the tongue cylinder 342, and controls the driving of the tongue cylinder 342 based on the driving signal output from the CPU 51 and input through the interface 54 as a result of the arithmetic processing of the CPU 51. . As a result, the tongue cylinder 342 is driven to rotate the tongue 31 around the axis in the X-axis direction, so that the position of the tongue 31 can be switched between the holding position and the release position.

  The cloth presser cylinder drive circuit 57 is connected to the cloth presser cylinder 352, and as a result of arithmetic processing of the CPU 51, the cloth presser cylinder 352 is driven based on a drive signal output from the CPU 51 and input via the interface 54. To control. As a result, the cloth presser cylinder 352 is driven, and the first cloth presser 33 can be moved up and down by rotating the first cloth presser 33 around the axis in the X-axis direction.

  The lower Y feed motor drive circuit 58 is connected to the lower Y feed motor 8, and as a result of the arithmetic processing of the CPU 51, the lower Y feed motor drive circuit 58 is driven based on the drive signal output from the CPU 51 and input via the interface 54. The drive of the motor 8 is controlled. Accordingly, the lower Y feed motor 8 is driven, and the sewing position by the second button sewing that positions the lower plate 41 and the force button holding portion 43 below the sewing needle N, and the holding portion 31a of the tongue 31. In addition, it is possible to switch to the sewing position by the first button sewing for positioning the support plate 32.

  The operation panel 7 includes predetermined switches for instructing various operations related to the sewing of the button B under the control of the CPU 51, and outputs predetermined signals to the CPU 51 based on operations of the operators of the switches. To do.

  The ROM 53 is, for example, a programmable semiconductor memory, and stores programs, control data, and the like related to various functions as the button sewing machine 100 executed by the CPU 51. Specifically, the ROM 53 stores a button sewing program 53a, a release / retreat operation control program 53b, and the like.

  The button sewing program 53a is a program for causing the CPU 51 to realize a function related to button sewing processing for sewing the button B to a predetermined position of the fabric C.

  The release / retraction operation control program 53b is a program executed by the CPU 51 as a control means when performing the second button sewing. Specifically, the release / retraction operation control program 53b causes the CPU 51 to move the tongue 31 to a release position that isolates the sewing needle N from the vertical movement path of the sewing needle N, and in conjunction with the movement of the tongue 31 to the release position. This is a program for controlling the tongue cylinder 342 and the cloth presser cylinder 352 so as to move one cloth presser 33 to a retracted position below the tongue 33 in the holding position.

  The RAM 52 is constituted by, for example, a volatile semiconductor memory, and a storage area for temporarily storing a work area by the CPU 51 and various programs and control data that can be executed by the button sewing machine 100 read from the ROM 53. And.

The CPU 51 develops a program designated from various programs stored in the ROM 53 in a work area in the RAM 52, and executes various processes according to the program.
Specifically, the CPU 51 reads the release / retraction operation control program 53b from the ROM 53 and performs the release / retraction operation when performing the second button sewing in the button sewing process executed according to the button sewing program 53a. Control of the tongue cylinder 342 and the cloth presser cylinder 352 is executed according to the control program 53b.

The button sewing process under the control of the CPU 51 will be described below with reference to FIGS.
5 to 8 are diagrams for explaining the button sewing process by the CPU 51. Of these, FIG. 5 shows a state in which the first cloth presser 33 is moved upward, and FIG. 7 shows a state in which the tongue 31 is moved to the release position, FIG. 7 shows a state in which the first cloth presser 33 is lowered and retracted, and FIG. 8 shows a state in which the tongue 31 is set in the holding position. .

  In the present invention, when the second button sewing is performed, that is, for example, immediately after the completion of the first button sewing (or every time when the sewing is completed), or a sewing pattern designated in advance. When the start of the second button sewing is instructed in accordance with the operation of the operator on the operation panel 7 or the like, the CPU 51 first performs drive control so as to push out the output rod 351 of the cloth presser cylinder 352, and The first cloth presser 33 located at the operating position is rotated through the presser link 353 so as to move upward (see FIG. 5). Thereby, it will be in the state arrange | positioned in the standby position above the fabric C where the contact part 334 of the 1st cloth presser 33 was bent.

Subsequently, the CPU 51 reads the release / retraction operation control program 53b from the ROM 53, develops it in the RAM 52, performs drive control to push the output rod 341 of the tongue cylinder 342 in accordance with the release / retraction operation control program 53b, and performs the tongue link 343. The tongue 31 is rotated about the base end of the tongue 31 through the shaft to move the tongue 31 to the release position (see FIG. 6), and the output of the cloth presser cylinder 352 is interlocked with the movement of the tongue 31. The upper surface of the curved extending portion 333 of the first cloth presser 33 is controlled by driving the rod 351 so that the rod 351 is retracted and rotating the first cloth presser 33 so as to move downward via the cloth presser link 353. Is moved to a retracted position below the holding portion 31a of the tongue 31 in the state of being arranged at the holding position (see FIG. 7). ).
Here, when the movement of the tongue 31 to the release position is performed after the completion of the first button sewing, the fabric C bent by the tongue 31 after the button B is sewn is removed by the operator. Become.

After that, when a rotation operation in the direction toward the holding position of the tongue 31 located at the release position is detected by a predetermined sensor according to the manual operation of the operator, the CPU 51 moves the output rod 341 of the tongue cylinder 342. The drive control is performed so that the tongue 31 is retracted, and the tongue 31 is automatically set by rotating the tongue 31 so that the holding portion 31a is positioned below the sewing needle N (see FIG. 8).
Further, the CPU 51 controls the driving of the lower Y feed motor 8 according to a predetermined control program, and moves and positions the lower plate 41 and the force button holding portion 43 below the sewing needle N in the Y axis direction. .

As described above, according to the button-attached sewing machine 100 of the present embodiment, the upper surface of the tongue 31 in the holding position for holding the fabric C when the second button-attaching sewing is performed. It is possible to move to a lower retreat position. That is, the tongue 31 is moved to the release position that isolates the sewing needle N from the vertical movement path of the sewing needle N, and the first cloth presser 33 is moved more than the tongue in the holding position in conjunction with the movement of the tongue 31 to the release position. By controlling the tongue cylinder 342 and the cloth presser cylinder 352 so as to be moved to the lower retracted position, an artificial work load for moving the first cloth presser 33 to a position that does not interfere with the setting of the fabric C is imposed. Can be reduced.
Thus, at the time of the second button sewing, the first cloth presser 33 can be retracted from the conveyance path of the fabric C for setting the cloth C at the sewing position in the second button sewing. Therefore, it is not necessary to set the cloth C so as to straddle the first cloth presser 33 as in the prior art, and the first cloth presser 33 can be appropriately set without being in the way. Thereby, workability | operativity of a 2nd button sewing can be improved, and the said work can be performed efficiently.

The present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the above embodiment, the first cloth presser 33 is configured to move up and down by driving the cloth presser cylinder 352, but the first cloth presser 33 is moved downward by the action of a predetermined biasing member. The first cloth presser 33 may be lifted by releasing the bias of the first cloth presser 33 based on the operation of an operation member such as a knee lever. Further, for example, as the cloth presser moving mechanism unit 35, the one provided with the cloth presser cylinder 352 that moves the first rod presser 33 up and down by moving the output rod 351 forward and backward is illustrated, but the invention is not limited thereto. The first cloth presser 33 may be configured to move up and down according to the rotational drive of the drive motor.
Furthermore, the tongue cylinder 342 is exemplified as the position switching drive means, but the present invention is not limited to this, and any object may be used as long as the position of the tongue 31 can be switched between the holding position and the release position.

Further, in the above embodiment, the first cloth presser 33 is configured to be restricted from rotating according to the length of the guide hole 335 in the longitudinal direction. However, the present invention is not limited to this. You may control according to the advance / retreat distance of the output rod 351 of the holding cylinder 352.
Moreover, although the structure which performs the setting with respect to the holding position of the tongue 31 distribute | arranged to the cancellation | release position via an operator's manual operation was illustrated, it is not restricted to this, For example, the holding position of the said tongue 31 You may set automatically. Accordingly, the tongue 31 can be automatically set following the releasing operation of the tongue 31 and the retracting operation of the first cloth presser 33, and the button sewing machine 100 is more convenient for the user. can do.

It is a perspective view which shows the buttoned sewing machine illustrated as one Embodiment to which this invention is applied. It is a perspective view which shows the 1st cloth presser and cloth presser movement mechanism part with which a sewing machine with a button is equipped. It is a figure for demonstrating the sewing procedure of the button by the 1st button attachment sewing. It is a block diagram which shows the principal part structure of a sewing machine with a button. It is a figure for demonstrating button sewing processing. It is a figure which shows the continuation of FIG. 5 in a button sewing process. It is a figure which shows the continuation of FIG. 6 in a button sewing process. It is a figure which shows the continuation of FIG. 7 in a button sewing process.

Explanation of symbols

100 sewing machine 31 with button 31 tongue 31a holding part 33 first cloth presser (cloth presser)
342 tongue cylinder (tang drive means)
35 Cloth presser moving mechanism 352 Cloth presser cylinder (cloth presser drive means)
C Cloth B Button 51 CPU (Control means)

Claims (2)

A holding portion for holding the fabric bent at the tip, and a tongue supported rotatably at a holding position where the fabric is placed in the vertical movement path of the needle and a release position where the cloth is separated from the vertical movement path A button sewing machine that uses a first button sewing to sew a button to the fabric and a second button sewing to sew a button to the fabric without using the tongue;
It is configured to be movable up and down between an operating position that contacts the tongue in the holding position via the fabric and a standby position above the tongue at the time of the first button sewing, and the tongue is held in the operating position. A cloth presser that presses and holds the fabric held in the section,
The cloth presser is configured to be able to descend to a retracted position below the tongue holding portion at the holding position in conjunction with the movement of the tongue to the release position at the time of the second button sewing.
A button sewing machine, wherein the sewing machine is lowered to the retracted position during the second button sewing. Cloth pressing drive means for applying a driving force for vertical movement to the cloth pressing;
Tongue driving means for applying a driving force for moving the tongue between the holding position and the release position;
The cloth retainer is moved so that the tongue is moved to the release position and the cloth retainer is lowered to the retracted position in conjunction with the movement of the tongue to the release position when performing the second button sewing. 2. The button-attached sewing machine according to claim 1, further comprising a driving unit and a control unit that controls the tongue driving unit.

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