JP4799842B2 - Sewing machine intermediate presser - Google Patents

Description

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

Conventionally, in a sewing machine that performs sewing while transporting a cloth in the XY direction without using a feed dog, such as an embroidery sewing machine, in order to prevent the cloth from rising and fluttering due to friction with the needle, An intermediate presser device that presses down the vicinity of the needle penetration portion of the cloth when the needle is raised is provided. This device normally presses the cloth downward with an intermediate presser when the needle is lifted from the cloth, and the intermediate presser is lifted together with the needle after the needle is completely lifted from the cloth.
As such an intermediate presser device, a device is disclosed in which the position of the intermediate presser can be adjusted by adjusting the inclination of the link constituting the oscillating body that moves the intermediate presser up and down by rotating the cam or knob ( For example, see Patent Document 1.)
In the intermediate press device disclosed in Patent Document 1, the intermediate presser is retracted by raising the intermediate presser bar clamp through the link by driving the solenoid, and the solenoid is turned off by turning off the sewing machine. When it is cut, the force that acts on the link from the solenoid disappears, so the intermediate presser descends to the intermediate presser lower position. Therefore, do not use a solenoid to retract the intermediate presser, but use a mechanical mechanism such as a cam to retract the intermediate presser to the intermediate presser retracted position so that the intermediate presser does not descend even after the machine power is turned off. A presser device has also been proposed.
Japanese Patent Laid-Open No. 9-253365

  However, in the conventional intermediate presser, after the power supply of the sewing machine is cut off, the intermediate presser is either lowered to the intermediate presser lower position or stays at the intermediate presser retracted position. If the intermediate presser is lowered to the lower position of the intermediate presser, the intermediate presser may interfere with the installation when attaching the presser frame as a preparation for sewing, or the presser frame may be damaged by contact with the presser frame when lowered. There was a problem. Also, if the intermediate presser remains in the intermediate presser retracted position, the intermediate presser interferes with the lowering of the needle bar during the hook alignment work that adjusts the synchronization of the lifting and lowering of the needle bar to which the sewing needle is attached and the rotation of the hook. There was a problem that the bar could not be lowered or the thread could not be passed through the sewing needle.

  Accordingly, the present invention has been made to solve the above-described problems, and sets the position of the intermediate presser after cutting off the power of the sewing machine by selecting either the intermediate presser retracting position or the intermediate presser lowering position. An object of the present invention is to provide an intermediate presser device for a sewing machine that can improve the workability after the power of the sewing machine is shut off.

In order to solve the above-described problems, the invention according to claim 1 is directed to the sewing needle (107) so that the sewing product is pressed against the needle plate (101) when the sewing needle (107) is pulled out from the sewing product. In the intermediate presser device (1) of the sewing machine having the intermediate presser (29) that moves up and down in synchronization with the vertical movement of
An elevating mechanism (M2) having an intermediate presser raising / lowering cam (45) in which a changing portion (45b) is formed in order to raise and lower the intermediate presser along the vertical movement direction of the sewing needle;
A motor (42) as drive means for rotating the intermediate presser lifting cam of the lifting mechanism;
Storage means for storing intermediate presser position data in which the intermediate presser retracting position and the intermediate presser lower position are associated with the drive amount of the driving means;
A control device (90) as drive control means for controlling the drive means based on the intermediate presser position data stored in the storage means when the sewing machine is powered off;
When sewing the presser frame toward the outer presser at the time of sewing and the presser frame that can be retracted to a predetermined position when the sewing machine power is cut off, is retracted to the predetermined position.
When the control device detects that the power of the sewing machine is cut off, the control device controls the motor based on the setting, and the position where the intermediate presser moves when the power is turned off is stored in the storage means. Further, the intermediate presser is selected from the retraction position and the lower position of the intermediate presser and is moved.
Here, the predetermined position means the presser on frame position is raised to the vicinity of the sewing machine arm pressing frame so presser frame after completion of sewing does not interfere.
The intermediate presser retracting position refers to the position where the intermediate presser is raised and separated from the needle plate after sewing is completed.The intermediate presser lower position refers to the intermediate presser after the sewing needle is removed from the sewing product during sewing. Refers to the position where the player returns and waits.

According to the first aspect of the invention, the drive control unit controls the drive unit based on the intermediate presser position data stored in the storage unit, so that the drive unit operates the lifting mechanism based on the intermediate presser position data. Let Here, if the drive means is driven so that the drive control means outputs a driving amount corresponding to the intermediate presser retracting position, the intermediate presser can be moved to the intermediate presser retracting position, and the intermediate presser obstructs the attachment. Or contact with the presser frame when lowered, and the presser frame is not damaged. In addition, when the drive means is driven so that the drive control means outputs a drive amount corresponding to the intermediate presser lower position, the intermediate presser can be moved to the intermediate presser lower position, and the intermediate presser prevents the needle bar from lowering. Thus, the needle bar cannot be lowered and the thread cannot be passed through the sewing needle. Therefore, the workability after the power supply of the sewing machine is shut off can be improved.

According to the first aspect of the present invention, when the drive means is driven so that the drive control means outputs a drive amount corresponding to the intermediate presser retracting position, the intermediate presser can be moved to the intermediate presser retracting position, The intermediate presser does not get in the way of attachment, and does not touch the presser frame when it is lowered and damage the presser frame. In addition, when the drive means is driven so that the drive control means outputs a drive amount corresponding to the intermediate presser lower position, the intermediate presser can be moved to the intermediate presser lower position, and the intermediate presser prevents the needle bar from lowering. Thus, the needle bar cannot be lowered and the thread cannot be passed through the sewing needle. Therefore, the workability after the power supply of the sewing machine is shut off can be improved.

Hereinafter, the best mode of an intermediate presser of a sewing machine according to the present invention will be described in detail with reference to the drawings.
[Embodiment 1]
<Configuration of sewing machine>
As shown in FIG. 1, a sewing machine 100 having an intermediate presser device 1 (see FIG. 2) according to the present invention includes a holding mechanism 106 that holds a sewn product between a presser frame 105 and an outer presser 104 and holds the sewn product. A feed mechanism (not shown) for moving the holding mechanism 106 in the horizontal direction, and moving the sewing product in the horizontal direction with respect to the sewing needle 107 in a state where the position in the horizontal plane is fixed, It is possible to attach a seam through a thread to an arbitrary position within a predetermined range (for example, the inside of the presser frame 105 and the outer presser 104 or a movable range of the holding mechanism 106 with respect to the sewing needle 107). Yes. Specifically, the sewing machine 100 is a cycle sewing machine capable of attaching seams corresponding to various shapes.

In the sewing machine 100, the holding mechanism 106 holds the outside of the portion where the sewing product is sewn by the presser frame 105 and the outer presser 104, and holds the position where the sewing needle 107 of the sewing product moves up and down. Since the presser frame 105 of the mechanism 106 is not pressed, the intermediate presser 29 (see FIG. 2) of the intermediate presser device 1 according to the present invention presses the portion where the sewing needle 107 of the sewing product moves up and down from above. It has become. That is, in the sewing machine 100, the sewing product is pressed downward by the presser frame 105 and the intermediate presser 29.

<Configuration of intermediate presser device>
As shown in FIGS. 2 to 4, the intermediate presser device 1 is provided on the upper shaft 2 that drives a needle bar, which has a sewing needle 107 at its tip, in the vertical direction. An eccentric cam 3 is fixed to the upper shaft 2, and a connection link 4 is connected to the eccentric cam 3. A rocking shaft holder 5 is connected to the connection link 4, and one end of the rocking shaft 6 is connected to the rocking shaft holder 5.
A proximal end portion of an intermediate presser adjustment arm 7 that adjusts the amount of movement of the intermediate presser in the vertical direction D1 is fixed to the other end portion of the swing shaft 6. A groove cam 7 a is formed on the intermediate presser adjusting arm 7. The groove cam 7a is an arc-shaped long hole, and a desired position of the groove cam 7a and one end portion of the first link 8 are rotatably fixed by an adjustment nut 9 and a step screw 10. This fixed position is formed between a position intersecting the axis of the swing shaft 6 and a range of a predetermined position on the one end side of the intermediate presser adjusting arm 7 from the intersecting position, and can be adjusted as desired within this range. it can.

The other end of the first link 8 is rotatably connected to the length of the second link 11 by a step screw 12. Further, the groove cam 7a with which the adjusting nut 9 is engaged becomes a part of an arc centered on the axis of the step screw 12 when the intermediate presser 29 is at the bottom dead center of the vertical reciprocating motion. A positioning link 13 is connected to the back side of the second link 11.
The positioning link 13 is rotatably attached to a sewing machine frame 15 as a sewing machine casing by a step screw 14 in the vicinity of the center thereof, and the position of the step screw 14 is the step screw when the intermediate presser 29 is at the bottom dead center. It matches the 12 position.

  A spring hook 13a is attached to one end of the positioning link 13, and a spring hook 15a is also fixed to the sewing machine frame 15. A coil spring 16 is bridged between the two spring hooks, and the spring hook 13a is One end of the attached positioning link 13 is biased so as to be lowered. That is, the coil spring 16 biases the connection portion P1 downward when the connection portion P1 of the second link 11 with the third link 20 moves upward. A stopper 17 is connected to the other end portion of the positioning link 13, and is connected to one end portion of the second link 11 and the other end portion of the positioning link 13 by one step screw 18. The stopper 17 is rotatably attached to the sewing machine frame 15 together with the positioning link 13 by a step screw 14. A regulating member 19 is provided above the one end portion 17a of the stopper 17 so as to regulate the upward rotation of the stopper 17. The regulating member 19 may be replaced with a part of the sewing machine frame 15. The intermediate presser swing mechanism M1 is configured by the first link 8, the second link 11, and the positioning link 13.

One end of the third link 20 is rotatably connected to the other end of the second link 11 by a step screw 21. One end of the fourth link 22 is rotatably connected to the other end of the third link 20 by a step screw 23 so as to be in series with the longitudinal direction of the third link 20. The third link 20 and the fourth link 22 constitute an intermediate presser link member 24.
A link relay plate 25 is connected to the other end of the fourth link 22 by a step screw 26. An intermediate presser bar holder 27 is fixed to the link relay plate 25, and the intermediate presser bar holder 27 holds an intermediate presser bar 28 extending in the vertical direction. An intermediate presser 29 is attached to the lower end portion of the intermediate presser bar 28 to press the fabric against the needle plate 101 during sewing. A coil spring 30 is provided at the upper end portion of the intermediate presser bar 28 and is attached to the intermediate presser bar holder 27 by bolts 31 and nuts 32.

The stepped screw 23 connects the third link 20 and the fourth link 22 together with the square piece 33 and the guide member 34. That is, a guide member 34 is provided on the front side of the fourth link 22, and a square piece 33 is provided on the front side of the guide member 34, and the third link 20, the fourth link 22, the square piece 33, The guide member 34 is connected by one step screw 23.
The square piece 33 serves as a spacer that fills the gap between the step screw 23 and the connecting portion P3 of the third link 20 and the fourth link 22, and prevents each link from rattling and smoothly drives each member. Let

  The guide member 34 is a substantially triangular plate member, and an upper end 34t is rotatably attached to the sewing machine frame 15 by a step screw 35. In the vicinity of the lower end portion of the guide member 34, a long hole 34a elongated in the vertical direction is formed. The long hole 34a is formed to have a width slightly larger than the diameter of the threaded portion of the step screw 23, and the step screw 23 is inserted into the long hole 34a. That is, the guide member 34 can move the connecting portion P3 of the third link 20 and the fourth link 22 in the vertical direction D1 of the intermediate presser 29 and crosses the series direction D2 of the third link 20 and the fourth link 22. The movement in the direction D3 is restricted.

  The guide member 34 has an end portion of a moving link 36 that moves the guide member 34 in a direction D3 across the series direction D2 of the third link 20 and the fourth link 22 in the vicinity of the upper portion of the elongated hole 34a by a step screw 37. It is pivotally connected. An eccentric cam 38 is connected to the other end of the moving link 36, and one end of a variable shaft 39 is connected to the eccentric cam 38. A motor 42 as drive means is connected to the other end of the variable shaft 39 via a bearing 40 and a bevel gear 41. The motor 42 is composed of, for example, a stepping motor, and the drive of the motor 42 is transmitted in the order of the variable shaft 39, the eccentric cam 38, and the moving link 36, and the moving link 36 moves the guide member 34.

A bevel gear 43 is meshed with the bevel gear 41, and the drive of the motor 42 can be output in a direction D 5 orthogonal to the axial direction of the variable shaft 39. A bearing 44, an intermediate presser raising / lowering cam 45, and the like are coaxially connected to the rear end of the bevel gear 43. That is, since the motor 42 also functions as a drive source for the intermediate presser lifting cam 45, the intermediate presser 29 is lifted and lowered by transmitting the driving force from the motor 42.
As shown in FIGS. 5 to 7, the intermediate presser raising / lowering cam 45 is formed in an arc shape having a substantially same distance from the rotation center to the outer peripheral surface with a center line passing through the rotation center as a boundary (hereinafter referred to as the center presser cam 45). , And the other is a shape in which the distance from the rotation center to the outer peripheral surface is larger than the distance from the rotation center to the outer peripheral surface in the maintenance unit 45a and changes smoothly (hereinafter referred to as change). Part 45b). Further, as shown in FIGS. 3 and 5 to 7, the intermediate presser lifting cam 45 is fixed to the drive shaft 51 that transmits the driving force transmitted from the motor 42 on one surface side of the intermediate presser lifting cam 45. The fixed portion 45c is formed. Furthermore, a protrusion 45d is formed on the fixed portion 45c so as to extend toward the outer peripheral edge of the changing portion 45b.

  The intermediate presser raising / lowering cam 45 raises and lowers the intermediate presser lifting member 46 that raises the intermediate presser 29 to the intermediate presser retracting position P <b> 5 (described later) after completion of sewing, and is provided at one end of the intermediate presser lifting member 46. The outer circumferential surface of the intermediate presser lifting cam 45 is in contact with the outer circumferential surface of the cylindrical roller 47. That is, when the maintaining portion 45a of the intermediate presser raising / lowering cam 45 is in contact with the roller 47, the intermediate presser lifting member 46 does not rise (see FIG. 7), but the changing portion 45b of the intermediate presser raising / lowering cam 45 is changed to the roller 47. The intermediate presser lifting member 46 is raised when it is in contact with (see FIG. 5). That is, the lifting mechanism M2 is configured by the intermediate presser lifting cam 45, the intermediate presser lifting member 46, and the roller 47.

  The intermediate presser lifting member 46 is rotatably attached to the sewing machine frame 15 by a pin 48 at its middle abdomen. The intermediate presser lifting member 46 is provided such that the other end thereof is positioned below the intermediate presser bar holder 27, and the changing portion 45 b of the intermediate presser raising / lowering cam 45 abuts against the roller 47 so that the intermediate presser lifting member 46 By raising the other end, the intermediate presser bar holder 27 can be raised and the intermediate presser 29 can be raised to the intermediate presser retracting position P5 (see FIG. 5). Further, the sewing machine frame 15 is provided with a spring hook 49 so as to be positioned above the intermediate presser lifting member 46, and one end portion of the coil spring 50 is hung on the spring hook 49, and the other end portion is in the middle. It is hung near one end of the presser lifting member 46. Thus, one end of the intermediate presser lifting member 46 is always urged upward.

Behind the protrusion 45d formed on the fixing portion 45c of the intermediate presser raising / lowering cam 45, the intermediate presser raising / lowering cam 45 is moved so as to move the intermediate presser 29 to the intermediate presser lower position P4 (described later) when the sewing machine 100 is powered off. An intermediate presser lifting / returning arm 52 that rotates the shaft is provided so as to extend in a direction perpendicular to the axis of the drive shaft 51. The intermediate presser lifting return arm 52 is a member formed in a bar shape, and a rear end portion thereof is attached to the sewing machine frame 15 via a coil spring 53 as an elastic member. The intermediate presser lifting return arm 52 is held when the urging force of the coil spring 53 is applied by a solenoid 54 that is activated when the sewing machine 100 is turned on and stopped when the sewing machine 100 is turned off. When is interrupted, the holding of the intermediate presser lifting return arm 52 is released, and the intermediate presser lifting return arm 52 jumps forward by the urging force of the coil spring 53 and pushes the projection 45d. That is, the movement control mechanism M3 is configured by the intermediate presser lifting return arm 52, the coil spring 53, and the solenoid 54.
Further, above the intermediate presser lifting cam 45, the intermediate presser lifting return arm 52 held by the solenoid 54 can be moved in and out between the tip portion and the protruding portion 45d, and the intermediate presser lifting return arm 52 is protruded 45d. There is provided a shielding plate 55 constituting a movement restricting mechanism M4 for preventing contact with the contact. That is, when it is not desired to rotate the intermediate presser lifting cam 45 in order to maintain the position of the intermediate presser 29, the shielding plate 55 is moved between the tip of the intermediate presser lifting return arm 52 and the protruding portion 45d. Good.

Here, the positional relationship between the intermediate presser 29 and the presser frame 105 will be described.
As shown in FIG. 8, the position where the intermediate presser 29 is waiting during sewing is referred to as an intermediate presser lower position P4, and the position where the intermediate presser 29 is retracted upward after the end of sewing is referred to as an intermediate presser retracted position P5. A position where the presser frame 105 presses the sewing product during sewing is referred to as a presser frame lower position, and a position where the presser frame 105 is retracted after the end of sewing is referred to as a presser frame upper position.
In these positional relationships, the height from the needle plate 101 decreases in the order of the intermediate presser retracting position P5, the presser frame upper position, the intermediate presser lower position P4, and the presser frame lower position.

<Operation of the intermediate presser during sewing>
Next, the operation of the intermediate presser device 1 having the above-described configuration will be described.
When the eccentric cam 3 is rotated by driving an upper shaft motor (not shown), the tip of the connection link 4 is in a direction substantially perpendicular to the axis of the upper shaft 2 (the series direction D2 of the third link 20 and the fourth link 22). Oscillates in the direction D3) transverse to the oscillating shaft, and the oscillating shaft holder 5 connected to the connection link 4 also oscillates in the same direction. When the swing shaft holder 5 swings, the swing shaft 6 also swings. Therefore, one end of the first link 8 serves as a swing fulcrum, and the other end of the first link 8 serves as the swing shaft 6. It swings in a direction substantially perpendicular to the axis (direction D3 transverse to the series direction D2 of the third link 20 and the fourth link 22). As the other end portion of the first link 8 swings, the other end portion of the second link 11 swings in the series direction D2 of the third link 20 and the fourth link 22, and the other end portion of the second link 11 The connected third link 20 and fourth link 22 swing in the series direction (vertical direction) D2. As the third link 20 and the fourth link 22 swing, the intermediate presser bar 28 connected to the fourth link 22 moves downward along the vertical direction D1, so the intermediate presser 29 also moves up and down.

<Adjustment operation of intermediate presser lower position by intermediate presser device>
Next, the adjustment operation of the intermediate presser lower position P4 by the intermediate presser device 1 having the above-described configuration will be described.
When the motor 42 is driven, the drive of the motor 42 is transmitted to the movable shaft 39 via the bevel gear 41 and the bearing 40, and the movable shaft 39 starts to rotate. The eccentric cam 38 is also rotated by the rotation of the movable shaft 39, and the moving link 36 is in a direction substantially orthogonal to the axis of the movable shaft 39 (a direction crossing the series direction D2 of the third link 20 and the fourth link 22). Swing to D3). As the moving link 36 swings, the guide member 34 swings in a direction D3 that intersects the series direction D2 of the third link 20 and the fourth link 22.

  At this time, as shown in FIG. 9, the stepped screw 23 of the connecting portion P3 of the third link 20 and the fourth link 22 connected by the long hole 34a of the guide member 34 has a screw portion formed by the long hole 34a. Since the movement of the third link 20 and the fourth link 22 in the direction D3 transverse to the series direction D2 is restricted, there is no place to release the force transmitted by the swing, and the step screw 23 extends along the long hole 34a. The angle θ formed by the third link 20 and the fourth link 22 connected in series changes in accordance with the movement following the guide member 34 of the step screw 23, and the intermediate presser link The member 24 has a substantially square shape. When the intermediate presser link member 24 has a substantially square shape, the distance L between both ends of the intermediate presser link member 24, in other words, the distance between one end of the third link 20 and the other end of the fourth link 22. L is shortened, and the intermediate presser 29 moves upward along the vertical direction D1. Thereby, the intermediate presser lower position P4 of the intermediate presser 29 can be adjusted.

<Retraction operation of intermediate presser by intermediate presser device>
Next, the operation when the intermediate presser 29 is moved to the intermediate presser retracting position P5 after completion of sewing will be described.
The adjustment of the intermediate presser lower position P4 is performed by adjusting each link ratio and rotating the motor 42 within a range of 0 ° to 180 °. The retraction of the intermediate presser 29 is performed by moving the motor 42 from 180 ° to 360 °. It is performed by rotating within the range.
That is, when adjusting the intermediate presser lower position P4, if the motor 42 is rotated within a range of 0 ° to 180 °, the maintaining portion 45a of the intermediate presser raising / lowering cam 45 is brought into contact with the roller 47. When retracting the presser 29, the respective parts are connected so that the changing portion 45b of the intermediate presser raising / lowering cam 45 abuts on the roller 47 when the motor 42 is rotated within a range of 180 ° to 360 °.

  Accordingly, as shown in FIGS. 5 to 7, since the motor 42 rotates within a range of 0 ° to 180 ° during sewing, the maintaining portion 45a contacts the roller 47 and the intermediate presser lifting link 46 does not rotate. . Therefore, the intermediate presser lifting link 46 does not push the intermediate presser bar holder 27 upward, and only the intermediate presser lower position P4 can be adjusted. However, when the sewing is finished and the motor 42 is rotated within a range of 180 ° to 360 °, the changing portion 45b comes into contact with the roller 47 and pushes down one end portion of the intermediate presser lifting link 46 downward. Then, the intermediate presser lifting link 46 rotates about the pin 48, the other end of the intermediate presser lifting link 46 moves upward, and pushes up the intermediate presser bar holder 27 installed on the movement path. Thereby, the intermediate presser 29 can be raised to the intermediate presser retracting position P5.

<Up-and-down movement of the intermediate presser when the sewing machine power is cut off>
Next, the operation for raising and lowering the intermediate presser 29 after the end of sewing will be described.
If the intermediate presser 29 is in the intermediate presser retracted position when the power of the sewing machine 100 is cut off, the power of the solenoid 54 is cut off when the power of the sewing machine 100 is cut off. When the power source of the solenoid 54 is cut off, the holding of the intermediate presser lifting return arm 52 is released, so that the intermediate presser lifting return arm 52 is applied to the protrusion 45 d of the intermediate presser lifting cam 45 by the biasing force of the coil spring 53. Jump out. When the intermediate presser lifting return arm 52 comes into contact with the protrusion 45d, the kinetic energy of the intermediate presser lifting return arm 52 is transmitted to the protrusion 45d, and the protrusion 45d starts to rotate clockwise in FIG.

  Here, when the intermediate presser 29 is in the intermediate presser retracting position P5, the changing portion 45b of the intermediate presser raising / lowering cam 45 is in contact with the roller 47, and from the rotation center of the intermediate presser raising / lowering cam 45 to the maintaining portion 45a. Since the distance and the distance to the change portion 45b are different, as shown in FIG. 9, when the contact portion with the roller 47 is changed from the change portion 45b to the maintenance portion 45a, the contact position with the roller 47 gradually increases. Change. Thereby, when the protrusion 45d starts to rotate, the intermediate presser raising / lowering cam 45 rotates slowly without applying a rotational force thereafter. After that, as described above, the contact position with the roller 47 is changed from the changing portion 45b to the maintaining portion 45a by the rotation of the intermediate presser raising / lowering cam 45, so that the intermediate presser lifting link 46 is counterclockwise in FIG. The intermediate presser 29 descends toward the intermediate presser lower position P4.

  On the other hand, when it is desired to maintain the intermediate presser 29 at the intermediate presser retracting position P5 even after the power of the sewing machine 100 is shut off, the shielding plate 55 is moved between the protruding portion 45d and the intermediate presser lifting return arm 52. As a result, even if the power of the solenoid 54 is shut off and the intermediate presser lifting return arm 52 jumps out toward the projecting portion 45d, the intermediate presser lifting return arm 52 collides with the shielding plate 55 and moves to the projecting portion 45d. Therefore, the intermediate presser lifting cam 45 does not rotate, and the intermediate presser 29 can be maintained at the intermediate presser retracting position P5.

<Effect of Embodiment 1>
According to the intermediate presser device 1 of the sewing machine according to the first embodiment, when the power of the sewing machine 100 is shut off, the intermediate presser lifting / returning arm 52 contacts the protrusion 45d of the intermediate presser lifting / lowering cam 45 to rotate the intermediate presser lifting / lowering cam 45. Thus, the intermediate presser 29 can be moved to the intermediate presser lower position P4. The intermediate presser 29 interferes with the lowering of the needle bar so that the needle bar cannot be lowered or the thread is passed through the sewing needle 107. There is no such thing as being impossible. Further, when the power of the sewing machine 100 is cut off, the shielding plate 55 restricts the rotation of the intermediate presser raising / lowering cam 45 by the intermediate presser lifting return arm 52, whereby the intermediate presser 29 can be maintained at the intermediate presser retracting position P5. The presser 29 does not obstruct the attachment, and does not damage the presser frame 105 by coming into contact with the presser frame 105 (see FIG. 1) when lowered. Therefore, workability after the power source of the sewing machine 100 is shut off can be improved.

[Embodiment 2]
<Configuration of intermediate presser device>
As shown in FIGS. 2, 10, and 11, the intermediate presser device 1 </ b> G according to the second embodiment controls the lifting and lowering of the intermediate presser 29 with the control device 90 instead of the movement control mechanism and the movement restriction mechanism according to the first embodiment. It is comprised as follows. In addition, since it is the structure similar to Embodiment 1 about components other than the control apparatus 90, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 11, the control device 90 includes a CPU 91 that performs various processes, and a memory 92 as a storage unit that stores programs and data.
The memory 92 includes a work area 93 where the CPU 91 performs processing, a data area 94 where data used for processing is recorded, and a program area 95 where a program for causing the intermediate presser to perform each operation is formed. ing.
In the data area 94, intermediate presser position data 94a in which the intermediate presser retracting position P5 and the intermediate presser lower position P4 are associated with the drive amount of the motor 42 is stored. More specifically, in the intermediate presser position data 94a, the rotation angle of the shaft of the motor 42 required to move the intermediate presser 29 to the intermediate presser retracted position and the intermediate presser 29 to move to the intermediate presser lower position. The necessary rotation angle of the shaft of the motor 42 is stored.
In the program area 95, a drive control program 95a for controlling the drive of the motor 42 based on the intermediate presser position data 94a stored in the data area 94 is stored. That is, the control device 90 functions as a drive control unit when the CPU 91 executes the drive control program 95a.

<Up-and-down movement of the intermediate presser when the sewing machine power is cut off>
Next, the control of the control device 90 when raising and lowering the intermediate presser 29 after the end of sewing will be described.
When the setting to set the intermediate presser 29 to the intermediate presser lower position P4 is made, when the control device 80 detects that the power source of the sewing machine 100 is cut off, the control device 80 detects the built-in power holding device ( For example, the shaft of the motor 42 is rotated by an amount based on the intermediate presser position data 94a using the electric power of the capacitor). The driving force of the motor 42 is transmitted to the intermediate presser raising / lowering cam 45 via the bevel gears 41 and 43, and the intermediate presser raising / lowering cam 45 is rotated by the angle set in the intermediate presser position data 94a clockwise in FIGS. Rotate.

  Here, when the intermediate presser 29 is in the intermediate presser retracting position P5, the changing portion 45b of the intermediate presser raising / lowering cam 45 is in contact with the roller 47, and from the rotation center of the intermediate presser raising / lowering cam 45 to the maintaining portion 45a. Since the distance and the distance to the change portion 45b are different, as shown in FIG. 9, when the contact portion with the roller 47 is changed from the change portion 45b to the maintenance portion 45a, the contact position with the roller 47 gradually increases. Change. As a result, when the intermediate presser lifting cam 45 starts to rotate, the intermediate presser lifting cam 45 slowly rotates without applying a rotational force thereafter. After that, as described above, the contact position with the roller 47 is changed from the changing portion 45b to the maintaining portion 45a by the rotation of the intermediate presser raising / lowering cam 45, so that the intermediate presser lifting link 46 is shown in FIGS. The intermediate presser 29 starts to rotate counterclockwise and descends toward the intermediate presser lower position P4.

  On the other hand, when the setting of setting the intermediate presser 29 to the intermediate presser retracting position P5 is made, the motor 42 remains stopped by controlling the control device 80 not to send a signal for driving the motor 42. Thus, the intermediate presser lifting cam 45 does not rotate, and the intermediate presser 29 can be maintained at the intermediate presser retracting position P5.

<Effects of Second Embodiment>
According to the intermediate presser 1G of the sewing machine in the second embodiment, when the CPU 91 of the control device 90 executes the drive control program 95a, the motor 42 operates the intermediate presser lifting cam 45 based on the intermediate presser position data 94a. Here, when the control device 90 rotates the shaft of the motor 42 so as to output a driving amount corresponding to the intermediate presser retracting position P5, the intermediate presser 29 can be moved to the intermediate presser retracting position P5. Does not obstruct the attachment, and does not damage the presser frame 105 by contacting the presser frame 105 (see FIG. 1) when lowered. Further, when the control device 90 rotates the shaft of the motor 42 so as to output a driving amount corresponding to the intermediate presser lower position P4, the intermediate presser 29 can be moved to the intermediate presser lower position P4. There is no possibility that the needle bar cannot be lowered due to the lowering of the needle bar or that the thread cannot be passed through the sewing needle 107. Therefore, workability after the power source of the sewing machine 100 is shut off can be improved.

  The present invention is not limited to the above embodiment. For example, the lifting / lowering of the intermediate presser 29 after the power supply of the sewing machine 100 is not required to be built in the sewing machine 100, and the intermediate presser 29 can be moved to the intermediate presser retraction position P5 and the intermediate presser lower position P4. The intermediate presser drive member configured as described above may be attached from the outside of the sewing machine 100, and the intermediate presser 29 may be moved by the manual operation of the operator. Thus, by manually operating the intermediate presser driving member from the outside of the sewing machine 100, the intermediate presser 29 can be moved to the intermediate presser retracted position P5 and the intermediate presser lower position P4. Here, when the intermediate presser 29 is moved to the intermediate presser retracting position P5 by operating the intermediate presser drive member, the intermediate presser 29 becomes in the way of attachment or comes into contact with the presser frame 105 when it is lowered, and the presser frame 105 is damaged. I will not let you. Further, if the intermediate presser 29 is moved to the intermediate presser lower position P4 by operating the intermediate presser drive member, the intermediate presser 29 may not be able to lower the needle bar because it interferes with the lowering of the needle bar, or the sewing needle There is no such thing as being unable to thread 107. Therefore, workability after the power source of the sewing machine 100 is shut off can be improved.

Further, the number, the connecting position, and the connecting order of the links constituting the intermediate presser swinging mechanism M1 are arbitrary, and any mechanism that outputs swinging of the intermediate presser 29 in the vertical direction D1 can be freely used. It can be changed.
Further, in the embodiment, the data necessary for setting the desired intermediate presser lower position P4 is stored in the control device 90. However, the driving amount of the motor 42 may be set every time sewing is performed by the operator. Good.
Further, even if the intermediate presser lifting cam 45 and the intermediate presser lifting link 46 are not provided, the output shaft of the motor 42 may be eccentric and the intermediate presser 29 may be moved to the intermediate presser retracting position P5.

It is a schematic perspective view of a sewing machine. It is a side view of an intermediate presser. It is a disassembled perspective view of an intermediate pressing device. It is a disassembled perspective view of an intermediate pressing device. It is a side view explaining the raising / lowering mechanism (before evacuation) of an intermediate presser. It is a side view explaining the raising / lowering mechanism (during retraction) of an intermediate presser. It is a side view explaining the raising / lowering mechanism (after retraction | saving) of an intermediate presser. It is a figure explaining the positional relationship of an intermediate presser and a presser frame . It is a figure explaining the change of the height from the needle plate of the contact position of a middle presser raising / lowering cam and a roller. It is a side view explaining the raising / lowering mechanism of the intermediate presser of the intermediate press apparatus in Embodiment 2. FIG. 6 is a configuration block diagram of a control device for an intermediate presser device according to a second embodiment.

Explanation of symbols

1 Intermediate presser 11 Second link 15 Sewing machine frame 16 Coil spring 24 Intermediate presser link member 29 Intermediate presser 34 Guide member 34t, 55t Upper end portion 36 of guide member Moving link 42 Motor (drive means)
51 Movement mechanism 90 Control device (drive control means)
92 Memory (storage means)
94a Intermediate presser position data 95a Drive control program 100 Sewing machine 101 Needle plate 104 Outer presser 105 Presser frame 107 Sewing needle D1 Vertical direction of intermediate presser D2 Series direction of link D3 Direction transverse to the serial direction of link M1 Intermediate presser swing mechanism (First link 8, second link 11, positioning link 13)
M2 lifting mechanism (intermediate presser lifting cam 45, intermediate presser lifting member 46, roller 47)
M3 movement control mechanism (medium presser lifting return arm 52, coil spring 53, solenoid 54)
M4 movement restriction mechanism (shielding plate 55)
P1, P2 Connection part P3 Connection part P4 Intermediate presser lower position P5 Intermediate presser retraction position L Distance between connection parts Angle formed by adjacent links

Claims (1)

In a middle presser device of a sewing machine having an intermediate presser that moves up and down in synchronization with the vertical movement of the sewing needle so as to press the sewing product against the needle plate when the sewing needle is pulled out from the sewing product.
An elevating mechanism (M2) having an intermediate presser raising / lowering cam (45) in which a changing portion (45b) is formed in order to raise and lower the intermediate presser along the vertical movement direction of the sewing needle;
A motor (42) as drive means for rotating the intermediate presser lifting cam of the lifting mechanism;
Storage means for storing intermediate presser position data in which the intermediate presser retracting position and the intermediate presser lower position are associated with the drive amount of the driving means;
A control device (90) as drive control means for controlling the drive means based on the intermediate presser position data stored in the storage means when the sewing machine is powered off;
When sewing the presser frame toward the outer presser at the time of sewing and the presser frame that can be retracted to a predetermined position when the sewing machine power is cut off, is retracted to the predetermined position.
When the control device detects that the power of the sewing machine is cut off, the control device controls the motor based on the setting, and the position where the intermediate presser moves when the power is turned off is stored in the storage means. An intermediate presser device for a sewing machine, wherein the intermediate presser is selected and moved from a retracted position of the intermediate presser and a lower position of the intermediate presser.

Images