JP2010081990A - Cloth presser device for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operation efficiency by eliminating user's operation when a cloth presser for button hole is attached or detached. <P>SOLUTION: The cloth presser device 1 for sewing machine includes: the cloth presser 11 which presses cloth: a presser bar 12 which supports the cloth presser and moves vertically between a pressing position where the cloth presser presses the cloth and a releasing position of releasing pressing of the cloth; a biasing member 19 which biases the presser bar downward; a presser bar drive mechanism 20 which engages with the presser bar and moves up the presser bar against biasing force; and a setting means 40 which selects a sewing pattern. The cloth presser device 1 includes: a detection means 50 which detects whether a cloth presser for buttonhole stitch is mounted to the presser bar; and a control means 60 which when detecting non-mounting of the cloth presser for buttonhole stitch to the presser bar while buttonhole stitch is set, operates a presser bar drive mechanism to move up the presser bar. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cloth presser device for a sewing machine.

The sewing machine is provided with a cloth presser that presses the cloth from above during sewing. The cloth presser is provided at the lower end of the presser bar urged toward the needle plate by the spring. When sewing is performed, the presser bar is lowered and the cloth presser presses the cloth by the biasing force of the spring acting on the presser bar. On the other hand, when raising the cloth presser, the cloth presser can be pulled away from the cloth by raising the presser bar against the urging force of the spring. The presser bar is raised by a lever operation by a user or a driving device such as a solenoid (see, for example, Patent Document 1).
JP 2008-000422 A

By the way, as the cloth presser, those suitable for each sewing pattern are used. For example, when buttonhole sewing is performed, a cloth presser for buttonhole sewing is used. The cloth retainer for buttonhole sewing can only be used for buttonhole stitching, and since it cannot be used for other purposes, it is necessary to replace the cloth retainer when switching between buttonhole stitching and other stitches. To do.
Here, when attaching and detaching the buttonhole sewing, since the work must be performed with the presser bar raised, the user needs to operate the lever or drive the solenoid, which is troublesome.

  Accordingly, the present invention has been made to solve the above-described problems, and can eliminate the user's operation when attaching / detaching the button presser cloth presser and can improve the work efficiency. It aims at providing a pressing device.

The invention described in claim 1
A cloth presser (11) for pressing the cloth placed on the needle plate (9);
A presser bar (12) that is detachably attached to the cloth presser, and that moves up and down between a pressing position where the cloth presser presses the cloth and a release position that releases the press of the cloth;
An urging member (19) for urging the presser bar downward toward the needle plate;
A presser bar drive mechanism (30) that engages with the presser bar and raises the presser bar against an urging force;
In a cloth presser device (1) for a sewing machine comprising: setting means (40) for selecting a desired sewing pattern from a plurality of sewing patterns including buttonhole sewing.
Detection means (50) for detecting whether or not a button presser cloth presser is attached to the presser bar;
When the setting means is selected to perform buttonhole sewing, when the detection means detects that a cloth presser for buttonhole sewing is not attached to the presser bar, the presser bar driving mechanism is Control means (60) for operating and raising the presser bar;
It is characterized by providing.

The invention according to claim 2 is a cloth presser device for a sewing machine according to claim 1,
The control means, when the setting means has not been selected to perform buttonhole sewing, when the detection means detects that a cloth presser for buttonhole sewing is attached to the presser bar, The presser bar driving mechanism is operated to raise the presser bar.

According to the first aspect of the present invention, when the setting means detects that the buttonhole sewing is not attached to the presser bar when the setting means has selected to perform buttonhole sewing. In addition, the control means operates the presser bar driving mechanism to raise the presser bar.
Thereby, since the cloth presser mounted by the detection means can be determined and the press bar can be raised by the control means, the user's operation when attaching the presser for the buttonhole to the press bar can be omitted. , Work efficiency can be improved.

According to the second aspect of the present invention, when the setting means detects that the buttonhole sewing cloth presser is attached to the presser bar when the setting means does not select the buttonhole sewing. In addition, the control means operates the presser bar driving mechanism to raise the presser bar.
As a result, the cloth presser mounted by the detecting means can be determined and the press bar can be raised by the control means, so that the user's operation when removing the button presser for the buttonhole from the press bar can be omitted. , Work efficiency can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a best embodiment of a cloth presser device for a sewing machine according to the invention will be described in detail with reference to the drawings. In the present embodiment, the direction of each part of the sewing machine is determined based on the XYZ axes shown in the drawings. In a state where the sewing machine is installed on a horizontal plane, the Z-axis direction indicates the vertical direction that is the vertical direction, the Y-axis direction indicates the left-right direction that coincides with the longitudinal direction of the sewing machine arm portion, the X-axis direction is horizontal and the Y-axis direction An orthogonal front-rear direction is shown.

<Configuration of sewing machine cloth presser>
(overall structure)
As shown in FIGS. 1 and 2, the sewing machine cloth presser device 1 is provided in the vicinity of the distal end portion of the arm portion 101 of the sewing machine 100.
The cloth presser 1 of the sewing machine supports the cloth presser 11 so as to be movable up and down at a lower position L for pressing the cloth that is a sewing object placed on the needle plate 9 and an upper position H that waits upward when not sewing. The cloth presser lifting / lowering mechanism 10 as a presser bar driving mechanism, the first operation mechanism 20 for moving the cloth presser 11 to the lower position L and the upper position H by the operation of the operator, and the cloth presser 11 by driving of a drive device such as a solenoid. A second operation mechanism 30 as a presser bar driving mechanism that moves to a lower position L and an upper position H, an operation panel 40 as a setting means for selecting a desired sewing pattern from a plurality of sewing patterns including buttonhole sewing, and a presser The detection unit 50 as a detecting means for detecting whether or not a buttonhole sewing cloth presser is attached to the bar 12 and the operation panel 40 are selected to perform buttonhole sewing. In this case, when the detecting unit 50 detects that the presser bar 12 is not equipped with the cloth presser for buttonhole sewing, the second operating mechanism 30 is operated to raise the presser bar 12 as a control means. And a control device 60 (see FIG. 8).

(Cloth presser lifting mechanism)
As shown in FIGS. 1 and 2, the cloth presser lifting and lowering mechanism 10 includes a cloth presser 11 that presses down the cloth placed on the needle plate 9 from above, a presser bar 12 that supports the cloth presser 11 at the lower end, A pressing bar holder 13 having an extending portion 13a fixed to the pressing bar 12 and extending in the horizontal direction, a pressing spring 19 as an urging member that constantly urges the pressing bar 12 downward, and on the way to the lower position L And an urging direction switching mechanism 14 that urges the cloth presser 11 downward from the position and urges the cloth presser 11 upward from a position on the way to the upper position H.

  The cloth presser 11 is supported by a lower end of a presser bar 12 supported at the tip of the sewing machine arm 101 so as to be movable up and down. During sewing, an upper shaft rotated by a sewing machine motor 90 (see FIG. 8) described later. According to the rotation, it moves up and down in the vicinity of the lower position L in synchronization with a needle drive mechanism (not shown). Further, the cloth presser 11 is retracted to the upper position H above the height near the lower position L, which is the vertical movement range during the sewing, for example, when not sewing such as when taking out the workpiece. It is possible to move to the uppermost position T which is further above the upper position H via the one operation mechanism 20. The uppermost position T is a position at which the cloth presser 11 can be lifted by lifting the manual operation lever 21 (described later) against the biasing force of the presser spring 19. When the object is placed on or removed from the throat plate 9, it is a retreating part for releasing the cloth presser 11 upward. The fabric retainer 11 is raised to the uppermost position T by the operator's manual operation, and then lowered and disposed at the upper position H when the operator releases the manual operation lever 21.

  The presser bar 12 is equipped with a presser spring 19 which is a coiled compression spring. The upper end of the presser spring 19 is locked by a locking member 17 fixed to the sewing machine arm portion 3, and the lower end is held by a presser bar. 13 is locked to the upper surface.

  The biasing direction switching mechanism 14 has a protrusion 16 that is rotatably supported by the sewing machine arm portion 101 via a shaft 15. The protrusion 16 is provided at a base end portion of a manual operation lever 21 which will be described later, and supports the presser bar holder 13 that is always urged downward by the urging force of the presser spring 19 to support the cloth presser 11 from below. Defines the height. In other words, when the manual operation lever 21 is arranged at the lower position L, the cloth presser 11 is moved to the lower position L by the left inclined portion of the projection 16 in FIG. The holding bar holder 13 is supported at the height to be arranged. Here, when the manual operation lever 21 is rotated counterclockwise in FIG. 2 and moved to the upper position H, the apex of the protrusion 16 is moved along the lower surface of the presser bar holder 13 and the protrusion When the right inclined portion of 16 approaches the lower surface of the presser bar holder 13, the presser bar holder 13 is constantly biased downward, so that the right inclined portion is in contact with the lower surface of the presser bar holder 13, that is, The urging direction is switched in the direction in which the cloth presser 11 is disposed at the upper position H. When the manual operation lever 21 is rotated clockwise and moved to the lower position L, the apex of the protrusion 16 is moved along the lower surface of the presser bar holder 13, and the left side of the protrusion 16 When the inclined portion of the pressing member approaches the lower surface of the presser bar holder 13, the biasing direction is switched to a direction in which the left inclined part is in contact with the lower surface of the presser bar holder 13, that is, a direction in which the cloth presser 11 is disposed at the lower position L. It will be. The cloth presser 11 is maintained at the lower position L or the upper position H with a predetermined holding force.

(First operation mechanism)
The first operation mechanism 20 includes a manual operation lever 21 that raises and lowers the cloth presser 11 by an operator's manual operation, and a knee lift lever (not shown) that raises and lowers the cloth presser 11 by an operator's knee operation. As shown in FIGS. 1 and 2, the manual operation lever 21 is provided on the other end side of the protruding portion 16 via a shaft 15 and extends below the sewing machine arm portion 101. In addition, a cloth presser lifting link 25 is rotatably connected to the manual operation lever 21 via an arm member 24 fixed to the shaft 15. Then, by moving the cloth presser lifting link 25 to the vertical body side (the right side in FIG. 2), the cloth presser 11 is disposed at the lower position L, and conversely, the cloth presser lifting link 25 is moved to the sewing machine head side (the same left side). ), The cloth presser 11 is arranged at the upper position H.

(Second operation mechanism)
The second operation mechanism 30 includes a plurality of link members 26 and 27 connected to the cloth presser lifting link 25, a solenoid 31 (see FIGS. 2 and 8) connected to the link member 27, and driving and driving the solenoid 31. And a switch 32 for stopping.
The switch 32 is provided in front of the sewing machine arm 101, and the solenoid 31 can be driven by pressing the switch 32. By driving the solenoid 31, driving of the output shaft operates the links 26 and 27, and the cloth presser lifting link 25 can be moved by the operation.

(control panel)
As shown in FIG. 1, the operation panel 40 is provided in front of the trunk portion of the sewing machine arm 101. The operation panel 40 includes a display unit that displays information notified to the user, and a touch switch provided on the display unit, and a desired sewing pattern can be selected from among a plurality of sewing patterns displayed by the user from the touch switch. An input for selecting a sewing pattern is made, and this input signal is transmitted to the control unit 60.

(Detection unit)
The detection unit 50 includes an input unit 51 formed on the side surface of the sewing machine arm 101 and connected to the control unit 60. When the cloth holder for buttonhole sewing is attached to the presser bar 12, a signal of a button diameter and a signal of a feed amount from the cloth holder for buttonhole sewing are input to the input unit 51 via the connector 86. Is done. That is, since each signal is transmitted to the control unit 60 only when the button presser sewing connector 86 is connected, the control unit 60 determines whether or not this signal has been received. It is possible to determine whether or not a button presser cloth presser is attached.

(Cloth presser for buttonhole sewing)
Here, the cloth presser for buttonhole sewing will be described.
The cloth retainer 8 for buttonhole sewing is arranged so that the lower surface thereof faces the upper surface of the needle plate on which the cloth is placed.
As shown in FIGS. 2 and 3, the buttonhole sewing cloth presser 8 is slidably held by the presser body 81 attached to the lower end of the presser bar 12 and the presser body 81, and presses the cloth from above. In addition, a holding frame 82 that presses the cloth while moving as the cloth is fed during the sewing operation, a button holding device 83 as a button holding portion provided integrally with the holding body 81, and a sewing start position in buttonhole sewing A position detection device 84 (see FIG. 7) that detects the amount of displacement from time to time, and a button diameter detection device 85 (see FIG. 6) that detects the diameter of the button held by the button holding device 83.

(Presser body)
As shown in FIG. 3, a connecting rod 81 a for the presser bar 12 to grip and connect the presser body 81 is provided on the upper surface of the presser body 81. Therefore, the pressing body 81 can be attached to and detached from the pressing bar 12 by gripping and releasing the connecting bar 81 a by the pressing bar 12.
The presser body 81 is connected to a spiral spring 82 a provided at one end of the presser frame 82, and the presser body 81 is provided at one end of the presser frame 82 unless the presser frame 82 is moved by applying an external force. It is urged to contact the stopper 82s. The direction in which the spiral spring 82a pulls the presser 81 toward the stopper 82s is the forward feed direction in the cloth feed, and the direction in which the presser 81 is pulled away from the stopper 82s against the spiral spring 82a is the reverse feed direction in the cloth feed. .

(Holding frame)
As shown in FIGS. 3 and 4, the presser frame 82 is formed of a substantially rectangular plate whose longitudinal direction is along the cloth feeding direction, and fits the presser 81 in order to slide against the presser 81. A guide 82b is formed along the longitudinal direction. The presser frame 82 has an opening 82c for buttonhole sewing. A spiral spring 82 a that biases the stopper 82 s of the pressing frame 82 toward the pressing body 81 is provided inside the stopper 82 s provided at one end of the pressing frame 82. By this spiral spring 82a, the stopper 82s provided on the presser frame 82 before the start of sewing is in contact with the presser body 81.
At the both ends in the longitudinal direction of the presser frame 82, when the eyelet buttonhole stitches are sewn, there is an engagement as a core cord locking portion for locking each end side of the core cord used to reinforce the eyelet buttonhole seams. A stop groove 82d is formed. Two locking grooves 82d are formed at each end. The locking groove 82d is formed so as to pass through the needle drop position in the presser frame 82 and to be positioned linearly along the cloth feeding direction during sewing.

(Position detection device)
As shown in FIGS. 4 and 7, the position detection device 84 is configured by a so-called slide volume. The position detection device 84 is fixed to the upper surface of the pressing body 81 and extends along the cloth feeding direction, and a volume lever 84b provided on the variable resistor 84a so as to be slidable along the cloth feeding direction. And.
The variable resistor 84a is provided substantially parallel to the longitudinal direction of the presser frame 82, in other words, along the cloth feeding direction. The resistance value of the variable resistor 84a changes depending on the position of the volume lever 84b on the variable resistor 84a.
The volume lever 84b is gripped by gripping members 84c attached to the holding frame 82 so that both sides in the moving direction are sandwiched. Since the presser body 81 is fixed to the presser bar 12, when the presser frame 82 moves along the cloth feeding direction, the gripping member 84c also moves along the cloth feed direction, and the gripping member 84c. The volume lever 84b gripped by the needle also moves on the variable resistor 84a along the cloth feeding direction. Therefore, the resistance value of the variable resistor 84a changes according to the feed amount of the holding frame 82, and the detected voltage value changes. Since the presser frame 82 moves in accordance with the sewing feed operation, by using this, the position of the presser frame 82 in the cloth feed direction according to the detected voltage value, in other words, buttonhole sewing is performed. It is possible to measure the length of sewing performed.
The voltage value applied to the variable resistor 84 a can be detected by the control unit 60. The control unit 60 is configured so that the presser frame 82 is in the sewing start position with respect to the presser body 81, that is, the presser frame 82 in the cloth feeding direction from the state where one end of the presser frame 82 and the presser body 81 are in contact with each other. The position can be detected at any time.

(Button holding device)
As shown in FIGS. 2, 5, and 6, the button holding device 83 is fixed above the pressing body 81 and the position detecting device 84, and has a fixing portion 83a that holds a part of the outer periphery of the button, and the fixing portion 83a. And a sliding portion 83b that is disposed so as to be opposed to the pressing body 81 and that can be moved and adjusted, and clamps the button with the fixing portion 83a. The fixed portion 83a and the sliding portion 83b are configured to sandwich both end portions of an arbitrary diameter of the button. The sliding portion 83b can be moved and adjusted with respect to the pressing body 81 and the fixing portion 83a, but is configured to stay at a certain position unless an external force is applied, and slides according to the size of the button. By moving the moving part 83b, the button can be held in a stable state.

(Button diameter detector)
As shown in FIGS. 2, 5, 6, and 7, the button diameter detecting device 85 includes a rack 85 a that is fixedly mounted on the sliding portion 83 b of the button holding device 83, a pinion 85 b that meshes with the rack 85 a, and a pressing body 81. And a lead wire 85d for outputting the output signal of the potentiometer 85c to the controller 60.
The pinion 85b is mounted on the rotation amount detection shaft of the potentiometer 85c, and is fixed to the sliding portion 83b when the sliding portion 83b moves along the cloth feeding direction according to the size of the button to be sandwiched. The rack 85a also moves in the same direction, and the movement rotates the pinion 85b. Therefore, the rotation amount detection shaft of the potentiometer 85c rotates, and a detection signal corresponding to the movement amount of the sliding portion 83b is output to the control unit 60. Is possible.
The lead wire 85d outputs the voltage value signal detected by the variable resistor 84a and the output signal of the potentiometer 85c to the control unit 60, and is attached to and detached from the input unit 51 connected to the control unit 60 at the tip. A flexible connector 86 is provided.
Therefore, the detection unit 50 is configured by including the input unit 51 and the connector 86 provided in the sewing machine arm 101.

(Control part)
As shown in FIG. 8, the control unit 60 includes a CPU 61 that controls the operation of each unit, a RAM 62 that is a work area of the CPU 61, and a ROM 63 that stores a sewing program and a plurality of sewing pattern data.
The RAM 62 stores sewing pattern data selected by the operation panel 40.
In the ROM 63, when the operation panel 40 is set to perform buttonhole sewing, when the detection unit 50 detects that the presser bar 12 is not equipped with the buttonhole sewing cloth presser 8, 2 A program for operating the operation mechanism 30 to raise the presser bar 12 is stored. That is, when the button hole sewing is set and the CPU 61 executes this program, when the connector 86 is not inserted into the input unit 51 of the sewing machine arm 101, the second operation mechanism 30 is operated. The presser bar 12 is raised. Therefore, the control unit 60 functions as a control unit.
When the detection unit 50 detects that the presser bar 12 is fitted with the cloth presser 8 for buttonhole sewing when the operation panel 40 is not set to perform buttonhole sewing in the ROM 63, 2 A program for operating the operation mechanism 30 to raise the presser bar 12 is stored. That is, if the setting for performing buttonhole sewing is not performed and the CPU 61 executes this program, the second operating mechanism 30 is operated when the connector 86 is inserted into the input unit 51 of the sewing machine arm 101. The presser bar 12 is raised. Therefore, the control unit 60 functions as a control unit.
A sewing machine motor 90, an input unit 51, an operation panel 40, a solenoid 31, a switch 32, and a sewing switch 91 for inputting sewing start and stop are connected to the control unit 60.

<Up / down control of cloth presser>
As shown in FIG. 9, when the sewing pattern is selected by the operation of the operation panel 40 by the user (step S1), the CPU 61 determines whether or not buttonhole sewing is set (step S2).
When the CPU 61 determines in step S2 that buttonhole sewing has been set (step S2: YES), the CPU 61 determines whether the connector 86 is connected to the input unit 51, that is, the presser bar 12 is used for buttonhole sewing. Whether or not the cloth presser 8 is attached is determined based on whether or not a signal is received from the button presser 8 for sewing the buttonhole (step S3).

  In step S3, when the CPU 61 determines that the presser bar 12 is not equipped with the cloth presser 8 for buttonhole sewing (step S3: NO), the CPU 61 drives the solenoid 31 to raise the presser bar 12. (Step S4). Here, when it is determined that the presser bar 12 is not equipped with the cloth presser 8 for buttonhole sewing, the case where the presser bar 12 is not attached with any cloth presser and the presser bar 12 for sewing the buttonhole. This is a case where a cloth presser other than the cloth presser is attached.

  In step S4, the CPU 61 raises the presser bar 12, and then the user replaces the cloth presser (step S5). Then, the CPU 61 determines whether or not an input from the sewing switch 91 has been made (step S6). When the CPU 61 determines that the input of the sewing switch 91 has been made (step S6: YES), the CPU 61 lowers the presser bar 12 (step S7) and starts sewing (step S11).

  In step S3, when the CPU 61 determines that the presser bar 12 has the cloth presser 8 for buttonhole sewing (step S3: YES), the CPU 61 determines whether or not the sewing switch 91 has been input. (Step S8). When the CPU 61 determines that the input of the sewing switch 91 has been made (step S8: YES), the CPU 61 starts sewing (step S11).

  In step S2, if the CPU 61 determines that buttonhole sewing is not set (step S2: NO), the CPU 61 determines whether the connector 86 is connected to the input unit 51, that is, the buttonhole sewing to the presser bar 12. Whether or not the cloth presser 8 is attached is determined based on whether or not a signal is received from the button presser 8 (step S9).

  In step S9, when the CPU 61 determines that the presser bar 12 has the cloth presser 8 for buttonhole sewing (step S9: YES), the CPU 61 proceeds to the process of step S4. On the other hand, when the CPU 61 determines in step S9 that the presser bar 12 does not have the buttonhole sewing cloth presser 8 attached (step S9: NO), the CPU 61 determines whether or not the sewing switch 91 has been input. Is determined (step S10). When the CPU 61 determines that the input of the sewing switch 91 has been made (step S10: YES), the CPU 61 starts sewing (step S11).

  In step S11, the CPU 61 determines whether or not the sewing is completed while performing the sewing in accordance with the sewing program stored in the ROM 63 (step S12). If the CPU 61 determines that the sewing has been completed (step S12: YES), the CPU 61 ends this process.

<Effect>
According to the cloth presser device 1 of the sewing machine having the above-described configuration, when the buttonhole sewing is set by the operation panel 40, the connector 86 is not inserted into the input portion 51, that is, the presser bar 12 is not inserted. When it is detected that the button presser 8 is not attached, the control unit 60 operates the solenoid 31 to raise the presser bar 12.
As a result, the cloth presser that is attached can be determined based on whether or not the connector 86 and the input unit 51 are connected, and the presser bar 12 can be raised by the control unit 60. The user's operation when attaching 8 can be omitted, and the working efficiency can be improved.

Further, when the operation panel 40 is not set to perform buttonhole sewing, the connector 86 is inserted into the input portion 51, that is, the presser bar 12 is attached with the cloth presser 8 for buttonhole sewing. When it is detected that the control bar 60 is in operation, the controller 60 operates the solenoid 31 to raise the presser bar 12.
As a result, the cloth presser mounted can be determined based on whether or not the connector 86 and the input unit 51 are connected, and the presser bar 12 can be raised by the control unit 60. The user's operation when removing 8 can be omitted, and the working efficiency can be improved.

<Others>
The scope of the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the presser bar depends on whether or not the sewing pattern selected by the operation panel 40 is buttonhole sewing and whether or not the presser bar 12 is equipped with the cloth presser 8 for buttonhole sewing. Although the vertical movement of the presser bar 12 is controlled, the lifting and lowering of the presser bar 12 is controlled only by whether or not the presser bar 12 has the cloth presser 8 for buttonhole sewing regardless of the setting of the operation panel 40. You can also.
That is, the elevation of the presser bar 12 may be controlled only by determining whether or not the connector 86 is inserted into the input unit 51 of the sewing machine arm 101.

The front view which shows the outline of a sewing machine. The front view of the cloth pressing device provided in a sewing machine arm. The top view of the cloth presser for buttonhole sewing. The perspective view of the press frame in the cloth presser for buttonhole sewing. The top view of a button holding | maintenance apparatus. The top view of a button diameter detection apparatus. The perspective view of a position detection apparatus. The block diagram which shows the structure around the control apparatus of a sewing machine. The flowchart which shows the raising / lowering process of a pressing bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cloth presser device 8 Cloth presser for buttonhole sewing 9 Needle plate 11 Cloth presser 12 Presser bar 19 Presser spring (biasing member)
30 Second operation mechanism (presser bar drive mechanism)
40 Operation panel (setting means)
50 Detection part (detection means)
51 Input unit (detection means)
60 Control part (control means)
86 Connector (detection means)

Claims (2)

A cloth presser that holds the cloth placed on the needle plate,
A presser bar that is detachably mounted, and a presser bar that moves up and down between a press position where the presser presses the cloth and a release position that releases the presser of the cloth;
A biasing member that biases the presser bar downward toward the needle plate;
A presser bar driving mechanism that engages with the presser bar and raises the presser bar against an urging force;
In a cloth presser device for a sewing machine comprising: setting means for selecting a desired sewing pattern from a plurality of sewing patterns including buttonhole sewing,
Detecting means for detecting whether a cloth presser for buttonhole sewing is attached to the presser bar;
When the setting means is selected to perform buttonhole sewing, when the detection means detects that a cloth presser for buttonhole sewing is not attached to the presser bar, the presser bar driving mechanism is Control means for operating and raising the presser bar;
A cloth presser device for a sewing machine comprising:   When the control means detects that the presser bar is sewn with a cloth presser for buttonhole sewing when the setting means has not been selected to perform buttonhole sewing, 2. The cloth presser device for a sewing machine according to claim 1, wherein the presser bar drive mechanism is operated to raise the presser bar.

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