CN1757811B - Middle presser foot device of sewing machine - Google Patents

Abstract

A middle cloth pressing device of a sewing machine. The middle cloth pressing device (1) of the sewing machine is equipped with a method and a machine needle for pressing the sewing product toward the needle plate (101) when the machine needle (107) is pulled out from the sewing product. The intermediate presser foot (29) that moves up and down synchronously with the up and down movement of (107); presses the sewing product toward the needle plate (101) during sewing, and can retreat to a specified position when the power of the sewing machine (100) is cut off When the outer presser foot (104) retracts to the specified position, the intermediate presser foot (29) can move to the upper intermediate presser retracted position (P5) and the lower intermediate presser foot down position (P4) when the power is turned off. party. The intermediate presser device of this sewing machine can set the position of the intermediate presser after cutting off the power supply of the sewing machine by selecting a certain position between the retracted position of the intermediate presser foot and the position under the intermediate presser foot, so as to improve the operation after the power supply of the sewing machine is cut off. sex.

Description

Middle cloth pressing device of sewing machine

technical field

The invention relates to a middle cloth pressing device of a sewing machine. the

Background technique

In the past, in sewing machines such as cycle sewing machines and embroidery sewing machines, which hold the cloth by a frame-shaped pressing device and transport the cloth in the XY direction for sewing, in order to prevent the cloth from being twisted due to the friction between the cloth and the needle when the needle is raised, Sewing confusion caused by rising with the needle, so set the middle cloth pressing device. the

This intermediate cloth pressing device has an intermediate presser which moves up and down following the up and down movement of a random needle in a state of being pressed downward by an elastic force. Usually, the lower end of the intermediate presser foot touches the fabric when the needle is lowered. At this time, the state of pressing the fabric is maintained by the elastic force without following the descent of the random needle, and the needle inserted on the fabric rises and passes through the fabric. When pulling out, the middle presser foot is in a downward state and presses the fabric through the elastic force, and the middle presser foot follows the random needle and rises after the needle is pulled out from the fabric. the

As the above-mentioned intermediate cloth pressing device, it is known to adjust the inclination of the connecting rod constituting the oscillating body, which rotates the cam or the knob and moves the intermediate presser up and down; and the intermediate presser can adjust the The lower position (for example, refer to Patent Document 1). the

In the intermediate presser device disclosed in Patent Document 1, the intermediate presser foot is raised through the connecting rod by the drive of the solenoid to retract the intermediate presser foot, and the solenoid is cut off by cutting off the power supply of the sewing machine. When the power supply of the tube is turned on, since the force of the solenoid on the connecting rod disappears, the intermediate presser is lowered to the lower position of the intermediate presser. Here, instead of using a solenoid, the intermediate presser is retracted to the intermediate presser retracted position by using a mechanical mechanism such as a cam, and the intermediate presser remains at the intermediate presser retraction position even after the power supply of the sewing machine is cut off. not falling

Patent Document 1: Japanese Patent Laid-Open Publication No. 9-253365

However, in the conventional intermediate cloth pressing device, after the power supply of the sewing machine is cut off, the intermediate presser is at a position where the intermediate presser is lowered to the lower position of the intermediate presser or stops at the retracted position of the intermediate presser. In this way, there is the following problem: If the intermediate presser foot falls to the position under the intermediate presser foot, as a preparation for sewing, the intermediate presser foot will become an obstacle to the installation when the presser frame is installed, and it will contact the presser frame when it is lowered, causing the presser frame to damage. And there is also the following problem: if the intermediate presser foot is located at the intermediate presser foot retreat position, when adjusting the synchronization of the needle bar and the rotary hook to adjust the lifting of the needle bar where the organic needle is installed and the rotation of the rotary hook, the intermediate presser foot It becomes an obstacle to the descent of the needle bar, so that the needle bar cannot be lowered, and the sewing thread cannot pass through the needle. the

Contents of the invention

Therefore, in order to solve the above-mentioned problems, the object of the present invention is to provide an intermediate presser device for a sewing machine, which can select either the intermediate presser retreat position or the intermediate presser lower position for the position of the intermediate presser after the power supply of the sewing machine is cut off. It can be set at one position, which can improve the operability after turning off the power of the sewing machine. the

In order to solve the above problems, the intermediate cloth pressing device 1 of the sewing machine described in claim 1 is provided with the above-mentioned machine needle 107 in a manner to press the sewing product toward the needle plate 101 when the needle 107 is pulled out from the sewing product. The intermediate presser foot 29 that moves up and down in synchronization with movement is characterized in that the sewing product is pressed toward the needle plate 101 during sewing, and the outer presser foot 104 that can retract to a predetermined position when the power supply of the sewing machine 100 is turned off retracts to a predetermined position. In the predetermined position, when the power is turned off, the intermediate presser 29 can move to one of the upper intermediate presser retreat position P5 and the lower intermediate presser lower position P4. the

Here, the so-called predetermined position refers to the position on the outer presser foot that the outer presser foot is raised to near the machine head of the sewing machine so that the outer presser foot does not become an obstacle after sewing is completed. the

In addition, the so-called retracted position of the intermediate presser refers to the position where the intermediate presser is raised and separated from the needle plate after sewing is completed. After the needle is pulled out, the intermediate presser returns to the standby position. the

According to the invention described in claim 1, when the outer presser retracts to a predetermined position when the power of the sewing machine is turned off, the intermediate presser can move to a position selected from the upper intermediate presser retracted position and the lower intermediate presser down position. Here, when the presser frame is installed as a preparation for sewing, by moving the intermediate presser to the intermediate presser retracted position, the intermediate presser does not become an obstacle for installation, and does not come into contact with the presser frame when it is lowered, causing damage to the presser frame. Case. Moreover, when adjusting the synchronous adjustment operation of the needle bar on which the machine needle is mounted and the rotation of the rotary hook to coincide with the rotary hook, by moving the intermediate presser to the lower position of the intermediate presser, the intermediate presser does not become unstable. The obstacle of the descent of the needle bar thus causes the situation that the needle bar cannot descend and cannot pass through the suture thread on the machine needle. Therefore, operability after turning off the power of the sewing machine can be improved. the

The invention described in claim 2 is the intermediate cloth presser device 1 of the sewing machine described in claim 1, which is characterized in that it has an elevating drive mechanism M2 for raising and lowering the above-mentioned intermediate presser foot 29 along the vertical movement direction of the needle 107, and It is equipped with: when the power of the sewing machine 100 is cut off, a movement control mechanism M3 for actuating the lifting drive mechanism M2 so as to move the intermediate presser 29 to the lower position P4 of the intermediate presser; and when the power of the sewing machine 100 is turned off, A movement restricting mechanism M4 that restricts the control operation of the lifting drive mechanism M2 controlled by the movement control mechanism M3 so that the intermediate presser 29 is maintained at the intermediate presser retreat position P5. the

According to the invention described in claim 2, when the power supply of the sewing machine is cut off, the movement control mechanism activates the lifting drive mechanism, so that the intermediate presser can be moved to the position under the intermediate presser, and the intermediate presser does not become an obstacle for the lowering of the needle bar. As a result, the needle bar cannot be lowered and the needle cannot pass through the suture. In addition, when the power of the sewing machine is cut off, the movement restriction mechanism restricts the control action to the lifting drive mechanism controlled by the movement control mechanism, so that the intermediate presser can be maintained at the intermediate presser retracted position, and the intermediate presser does not become an obstacle to installation. , When it comes into contact with the pressure frame during the descent, the pressure frame is damaged. Therefore, operability after turning off the power of the sewing machine can be improved. the

The invention described in claim 3 is the middle cloth press device 1 of the sewing machine described in claim 1, which is characterized in that it has a lifting drive mechanism M2 that moves the above-mentioned middle presser foot 29 up and down along the vertical movement direction of the needle 107, and makes the above-mentioned The drive mechanism 42 that operates the lifting drive mechanism M2 and includes: a storage mechanism for storing intermediate presser foot position data 94a corresponding to the above-mentioned intermediate presser foot retreat position P5 and the above-mentioned intermediate presser foot lower position P4 and the driving amount of the above-mentioned drive mechanism 42 92: and the drive control means 90 for controlling the drive means 42 based on the intermediate presser foot position data 94a stored in the storage means 92 when the sewing machine 100 is powered off. the

According to the invention described in claim 3, the drive control means controls the drive means based on the intermediate presser position data stored in the storage means, and the drive means can operate the elevating drive means based on the intermediate presser position data. Here, if the drive control mechanism drives the drive mechanism so as to output a driving amount corresponding to the retracted position of the intermediate presser, the intermediate presser can be moved to the retracted position of the intermediate presser without the intermediate presser becoming an obstacle to installation. , When it comes into contact with the pressure frame during the descent, the pressure frame is damaged. In addition, if the drive control mechanism drives the drive mechanism so as to output a driving amount corresponding to the lower position of the intermediate presser, the intermediate presser can be moved to the lower position of the intermediate presser without causing the intermediate presser to become the lowering of the needle bar. Obstacles lead to the situation that the needle bar cannot descend and cannot pass the suture on the machine needle. Therefore, operability after turning off the power of the sewing machine can be improved. the

The invention described in Claim 4 is the middle cloth press device 1 of the sewing machine described in Claim 1, which is characterized in that it has a lifting drive mechanism M2 for raising and lowering the middle presser foot 29 along the vertical movement direction of the needle 107, and Equipped with an intermediate presser driving part, the intermediate presser driving part is provided on the above-mentioned lifting drive mechanism M2, and the above-mentioned intermediate presser can be moved by manual operation from the outside of the sewing machine 100 when the power of the sewing machine 100 is cut off. 29 moves to the aforementioned intermediate presser retreat position P5 and the aforementioned intermediate presser down position P4. the

According to the invention described in claim 4, the intermediate presser can be moved to the intermediate presser retracted position and the intermediate presser lower position by manually operating the intermediate presser driving member from the outside of the sewing machine. Here, after the intermediate presser is moved to the intermediate presser retreat position by the operation of the intermediate presser driving part, the intermediate presser does not become an obstacle to the installation, and does not contact the presser frame when it is lowered, causing damage to the presser frame. Case. Moreover, after the intermediate presser foot is moved to the lower position of the intermediate presser foot by the operation of the intermediate presser foot driving part, the intermediate presser foot will not become an obstacle to the descent of the needle bar, resulting in that the needle bar cannot be lowered and cannot be threaded on the machine needle. The case of sutures. Therefore, operability after turning off the power of the sewing machine can be improved. the

According to the invention described in claim 5, when the power of the sewing machine is turned off, the intermediate presser can move to a position selected from an upper intermediate presser retracted position and a lower intermediate presser down position. Here, when the press frame is installed as preparation for sewing, by moving the intermediate presser to the intermediate presser retracted position, the intermediate presser does not become an obstacle for installation, and does not touch the presser frame when it is lowered, causing the presser frame to be distorted. Injury situation. Moreover, when adjusting the synchronous adjustment operation of the needle bar on which the machine needle is mounted and the rotation of the rotary hook to coincide with the rotary hook, by moving the intermediate presser to the lower position of the intermediate presser, the intermediate presser does not become unstable. The obstacle of the descent of the needle bar thus causes the situation that the needle bar cannot descend and cannot pass the suture thread on the machine needle. Therefore, the operation after turning off the power supply of the sewing machine can be improved. the

(Invention effect)

According to the invention described in claim 1, when the presser frame is installed as a preparation for sewing, by moving the intermediate presser to the intermediate presser retracted position, the intermediate presser does not become an obstacle to installation and does not come into contact with the presser frame when it is lowered. Resulting in damage to the pressure frame. In addition, when adjusting the synchronization of the needle bar and the rotary hook to adjust the synchronization of the needle bar with the machine needle and the rotation of the hook, by moving the intermediate presser to the position under the intermediate presser, the intermediate presser will not become unstable. The obstacle of the descent of the needle bar thus causes the situation that the needle bar cannot descend and cannot pass the suture thread on the machine needle. Therefore, the operability after the power supply of the sewing machine is turned off can be improved. the

According to the invention described in claim 2, when the power supply of the sewing machine is turned off, the movement control mechanism activates the lifting drive mechanism, so that the intermediate presser can be moved to the position under the intermediate presser, and the intermediate presser does not become an obstacle to the descent of the needle bar. Thereby cause the situation that needle bar can not descend, can not pass suture thread on machine needle. In addition, when the power of the sewing machine is cut off, the movement restriction mechanism restricts the control action to the lifting drive mechanism controlled by the movement control mechanism, so that the intermediate presser can be maintained at the intermediate presser retracted position, and the intermediate presser does not become an obstacle to installation. , When it comes into contact with the pressure frame during the descent, the pressure frame is damaged. Therefore, operability after turning off the power of the sewing machine can be improved. the

According to the invention described in claim 3, if the drive control mechanism drives the drive mechanism so as to output a driving amount corresponding to the retracted position of the intermediate presser, the intermediate presser can be moved to the retracted position of the intermediate presser without generating intermediate pressure. The foot becomes an obstacle to the installation, and the pressure frame is damaged due to contact with the pressure frame when descending. In addition, if the drive control mechanism drives the drive mechanism so as to output a driving amount corresponding to the lower position of the intermediate presser, the intermediate presser can be moved to the lower position of the intermediate presser without the intermediate presser being an obstacle to the lowering of the needle bar. Thereby cause the situation that needle bar can not descend, can not pass suture thread on machine needle. Therefore, operability after turning off the power of the sewing machine can be improved. the

According to the invention described in claim 4, after the intermediate presser is moved to the intermediate presser retreat position by the operation of the intermediate presser driving member, the intermediate presser does not become an obstacle to installation or come into contact with the presser frame when descending. And lead to the situation that the pressure frame is damaged. In addition, after the intermediate presser foot is moved to the lower position of the intermediate presser foot through the operation of the intermediate presser foot driving part, the intermediate presser foot will not become an obstacle to the descent of the needle bar, resulting in that the needle bar cannot be lowered or cannot be placed on the needle. The case of passing through the suture. Therefore, operability after turning off the power of the sewing machine can be improved. the

According to the invention described in claim 5, when the power of the sewing machine is turned off and the presser frame is installed as a preparation for sewing, the intermediate presser is moved to the intermediate presser retracted position, so that the intermediate presser does not become an obstacle to installation and does not fall. Contact with the pressure frame at the time will cause the pressure frame to be damaged. In addition, when adjusting the needle bar and the rotary hook to adjust the synchronization of the needle bar and the rotary hook to adjust the lifting and lowering of the needle bar on which the machine needle is installed, by moving the intermediate presser to the lower position of the intermediate presser, the intermediate presser will not become unstable. The obstacle of the descent of the needle bar thus causes the situation that the needle bar cannot descend and cannot pass the suture thread on the machine needle. Therefore, the operation after turning off the power supply of the sewing machine can be improved. the

Description of drawings

Fig. 1 is a schematic perspective view of a sewing machine. the

Fig. 2 is a side view of the middle cloth pressing device. the

Fig. 3 is an exploded perspective view of the middle cloth pressing device. the

Fig. 4 is an exploded perspective view of the middle cloth pressing device. the

Fig. 5 is a side view explaining the raising and lowering drive mechanism of the intermediate presser (before retraction). the

Fig. 6 is a side view illustrating the lifting drive mechanism of the intermediate presser (during retraction). the

Fig. 7 is a side view explaining the raising and lowering drive mechanism of the intermediate presser (after retraction). the

Fig. 8 is a diagram illustrating the positional relationship between the intermediate presser and the outer presser. the

Fig. 9 is a view explaining the change in height of the needle plate from the butt joint between the middle presser lifting cam and the roller. the

Fig. 10 is a side view illustrating the drive mechanism for raising and lowering the intermediate presser foot of the intermediate cloth pressing device according to the second embodiment. the

Fig. 11 is a block diagram showing the configuration of the control device of the intermediate cloth pressing device according to the second embodiment. the

In the figure: 1-middle presser device, 11-second connecting rod, 15-sewing machine frame, 16-coil spring, 24-middle presser connecting rod part, 29-middle presser, 34-guiding part, 34t, 55t-the upper end of the guide member, 36-moving link, 42-motor, 51-moving mechanism, 90-control device (drive control mechanism), 92-memory (storage mechanism), 94a-middle presser foot position data, 95a -Drive control program, 100-sewing machine, 101-needle plate, 104-outer presser foot, 105-presser frame, 107-needle, D1-up and down direction of middle presser foot, D2-straight direction of connecting rod, D3-relative The straight direction of the connecting rods is transverse to the direction, M1-intermediate presser rocking mechanism (first connecting rod 8, second connecting rod 11, positioning connecting rod 13), M2-lifting drive mechanism (intermediate presser lifting cam 45, intermediate Presser foot lifting part 46, roller 47), M3-movement control mechanism (intermediate presser foot lifting return arm 52, coil spring 53, solenoid 54), M4-movement limiting mechanism (shielding plate 55), P1, P2- Connecting part, P3-connecting part, P4-down position of intermediate presser foot, P5-retracting position of intermediate presser foot, L-distance between connecting parts, θ-angle formed by adjacent connecting rods. the

Detailed ways

Example 1

(Configuration of sewing machine)

As shown in Figure 1, the sewing machine 100 with the middle cloth pressing device 1 (referring to Figure 2) of the present invention has a holding mechanism 106 that clamps and holds a sewn product between the needle plate and the outer presser foot 104, and makes the sewing machine The conveying mechanism (not shown) that moves the holding mechanism 106 in the horizontal direction moves the sewing product in the horizontal direction relative to the machine needle 107 whose position in the horizontal plane is fixed, within a predetermined range (for example, at the needle 107). Stitches can be formed with the thread at any position within the inner side of the plate 101 and the outer presser foot 104, or within the movable range of the conveying mechanism of the holding mechanism 106 of the needle 107). Specifically, the sewing machine 100 is a cycle sewing machine capable of forming stitches in various shapes. the

And, in the sewing machine 100, the holding mechanism 106 holds the outside of the part where the sewing product is sewn by the needle plate 101 and the outer presser foot 104. Since the outer presser foot 104 of the holding mechanism 106 does not become pressed against the sewing Therefore, the intermediate presser foot 29 (refer to FIG. 2 ) of the intermediate cloth pressing device 1 of the present invention presses the part where the needle 107 of the sewing object moves up and down from above. . That is, in the sewing needle 100 , the outer presser 104 and the middle presser 29 press the sewn product downward. the

(The composition of the middle cloth pressing device)

As shown in Figures 2-4, the middle cloth pressing device 1 is arranged on the upper shaft 2, and the upper shaft 2 drives the needle bar with the machine needle 107 at the front end to move in the up and down direction. The eccentric cam 3 is fixed on the upper shaft 2, and the connecting link 4 is connected on the eccentric cam 3. The rocking shaft abutment 5 is connected to the connecting rod 4 , and one end of the rocking shaft 6 is connected to the rocking shaft abutment 5 . the

At the other end of the rocking shaft 6, a base end portion of an intermediate presser adjusting arm 7 for adjusting the movement amount of the intermediate presser in the vertical direction D1 is fixed. A grooved cam 7 a is formed on the intermediate presser adjusting arm 7 . The grooved cam 7a is an arc-shaped long hole, and the desired position of the grooved cam 7a and one end of the first link 8 are rotatably fixed by the adjusting nut 9 and the segment screw 10 . This fixed position is formed between a position intersecting with the axis line of the rocking shaft 6 and a range from the intersecting position to a predetermined position on one end side of the intermediate presser foot adjusting arm 7, and can be performed within this range. adjustments required. the

The other end of the first link 8 is rotatably connected to the length portion of the second link 11 and the segment screw 12 . In addition, the grooved cam 7a engaged with the adjusting nut 9 becomes a part of an arc centered on the axis of the segment screw 12 when the intermediate presser 29 is located at the bottom dead center of the vertical reciprocating movement. The positioning link 13 is connected to the back side of the second link 11 . the

The positioning link 13 is installed on the sewing machine frame 15 as the sewing machine frame by the segment screw 14 in the vicinity of its central part, and the position of the segment screw 14 is the same as that of the presser foot 29 when it is at the bottom dead center. The location of the segmented screws 12 is consistent. the

One end of the positioning link 13 is provided with a spring hook 13a. In addition, a spring hook 15a is also fixed on the sewing machine frame 15, and a coil spring 16 is set between the two spring hooks, and is pulled downwards. A force is applied to one end of the positioning link 13 provided with the spring hook 13a. That is, when the connecting portion P1 of the second link 11 and the third link 20 moves upward, the coil spring 16 urges the connecting portion P1 downward. The other end of the positioning link 13 is connected with a stopper 17 , and one end of the second link 11 and the other end of the positioning link 13 are connected by a segment screw 18 . In addition, the stopper 17 is rotatably mounted on the sewing machine frame 15 together with the positioning link 13 via the segment screw 14 . Above one end portion 17a of the stopper 17, a restricting member 19 for restricting upward rotation toward the stopper 17 is provided. In addition, this restricting member 19 may be replaced by a part of the sewing machine frame 15 . Furthermore, the intermediate presser foot rocking mechanism M1 is constituted by the first link 8 , the second link 11 , and the positioning link 13 . the

One end of a third link 20 is rotatably connected to the other end of the second link 11 via a segment screw 21 . To the other end of the third link 20 , one end of the fourth link 22 is rotatably connected in series with respect to the longitudinal direction of the third link 20 via a segment screw 23 . The third link 20 and the fourth link 22 constitute an intermediate presser link member 24 . the

A link relay plate 25 is connected to the other end of the fourth link 22 by a segment screw 26 . The intermediate presser rod abutment 27 is fixed on the connecting rod relay plate 25 , and the intermediate presser rod 28 extending in the up and down direction is held on the intermediate presser rod abutment 27 . An intermediate presser 29 for pressing the cloth against the needle plate 101 during sewing is attached to the lower end of the intermediate presser bar 28 . On the upper end of the middle presser rod 28, a coil spring 30 is arranged, and is installed on the middle presser rod arch 27 through a bolt 31 and a nut 32. the

The segment screw 23 connects the corner block 33 and the guide member 34 , and connects the third link 20 and the fourth link 22 . That is, a guide member 34 is provided on the front side of the 4th link 22, a corner block 33 is provided on the front side of the guide member 34, and the 3rd link 20, the 4th link 22, and the corner block are connected by a segment screw 23. 33. The guide part 34. the

The corner block 33 acts as a washer for filling the gap between the segment screw 23 and the connecting portion P3 of the third link 20 and the fourth link 22, and prevents rattling of each link so that each component can be driven smoothly. the

The guide member 34 is a substantially triangular plate, and an upper end portion 34t is rotatably attached to the sewing machine frame 15 by a segment screw 35 . In the vicinity of the lower end portion of the guide member 34, a long elongated hole 34a is formed along the vertical direction. The elongated hole 34 a is formed to have a width slightly larger than the diameter of the threaded portion of the segment screw 23 , and the segment screw 23 is inserted through the elongated hole 34 a. 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 foot 29, and also restricts the movement of the third link 20 to the fourth link. 22 moves in the direction D3 of the inline direction D2. the

Moreover, on the guide member 34, one end portion of a movable link 36 is rotatably connected near the upper portion of the elongated hole 34a by a step screw 37, and the movable link 36 makes the guide member 34 transversely cut the third link. 20 and the fourth link 22 move in the direction D3 of the straight direction D2. 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 a drive mechanism 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 . the

The bevel gear 41 is engaged with the bevel gear 43 , and the drive of the motor 42 can be output in the direction D5 perpendicular to the axial direction of the variable shaft 39 . At the rear end of the bevel gear 43, a bearing 44, an intermediate presser lifting cam 45, and the like are coaxially connected. That is, since the motor 42 can also function as the driving source of the intermediate presser lifting cam 45 , the lifting of the intermediate presser 29 is performed by transmitting the driving force from the motor 42 . the

The intermediate presser lifter cam 45, as shown in FIGS. 5 to 7, is formed in an arc shape with approximately equal distances from the center of rotation to the outer peripheral surface with the center line passing through the center of rotation as a boundary (hereinafter, referred to as a maintenance cam). 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 of the maintenance part 45a, and the other is formed in a smoothly changing shape (hereinafter referred to as a changing part 45b). In addition, as shown in FIG. 3 and FIGS. 5 to 7 , on one surface side of the intermediate presser foot lifting cam 45 , there is formed a drive shaft 51 for transmitting the driving force transmitted from the motor 42 for fixing the intermediate presser foot lifting cam 45 . The fixed portion 45c of the cam 45 . Furthermore, on the fixing portion 45c, a protrusion portion 45d extending toward the outer peripheral edge of the changing portion 45b is formed. the

The intermediate presser lifting cam 45 is a component that lifts the intermediate presser lifting member 46, and the intermediate presser lifting member 46 is used to raise the intermediate presser 29 to the intermediate presser retreat position P5 (described later) after sewing is completed. As a component, the outer peripheral surface of the cylindrical roller 47 provided at one end of the intermediate presser lifting member 46 abuts against the outer peripheral surface of the intermediate presser lifting cam 45 . That is, although the intermediate presser lifting member 46 does not rise when the maintaining portion 45a of the intermediate presser lifting cam 45 abuts against the roller 47 (see FIG. 7 ), the changing portion 45b of the intermediate pressing lifting cam 45 and the When the rollers 47 butt against each other, the intermediate presser lifting member 46 rises (see FIG. 5 ). That is, the lifting drive mechanism M2 is constituted by the intermediate presser lifting cam 45 , the intermediate presser lifting member 46 , and the roller 47 . the

The intermediate presser lifting member 46 is rotatably mounted on the sewing machine frame 15 via a pin 48 at its center portion. The intermediate presser lifting part 46, the other end of which is located below the intermediate presser rod abutment 27, the changing part 45b of the intermediate presser lifting cam 45 abuts against the roller 47 and passes through the other end of the intermediate presser lifting part 46. One end rises, the intermediate presser rod abutment 27 can be raised, and the intermediate presser 29 can be raised to the intermediate presser retreat position P5 (refer to FIG. 5 ). In addition, on the sewing machine frame 15, a spring hook 49 is provided at a position above the intermediate presser foot lifting member 46, and one end of the coil spring 50 is hung on the spring hook 49, and the other end is hung on the intermediate presser foot. Near one end of the lifting member 46 . Thus, an upward force is always applied to one end portion of the intermediate presser foot lifting member 46 . the

At the rear of the protrusion 45d formed on the fixing portion 45c of the intermediate presser lifting cam 45, when the power supply of the sewing machine 10 is turned off, the intermediate presser 29 is moved to the intermediate presser lower position P4 (described later). The intermediate presser lift return arm 52 that rotates with the intermediate presser lift cam 45 is provided to extend in a direction perpendicular to the axis of the drive shaft 51 . The intermediate presser lift return arm 52 is a rod-shaped member, and its rear end is attached to the sewing machine frame 15 via a coil spring 53 as an elastic member. The intermediate presser foot lifting return arm 52 is held by the elastic force of the coil spring 53 through the solenoid 54 that starts when the power supply of the sewing machine 100 is turned on and stops when the power supply of the sewing machine 100 is cut off. When the power supply is turned on, the holding of the intermediate presser foot lifting return arm 52 is released, and the intermediate presser foot lifting return arm 52 is pushed forward under the elastic force of the coil spring 53 and presses the protrusion 45d. That is, the movement control mechanism M3 (movement control mechanism) is constituted by the intermediate presser lift return arm 52 , the coil spring 53 , and the solenoid 54 . the

Further, above the intermediate presser lifting cam 45, there is provided a shielding plate 55 constituting a movement limiting mechanism M4 (movement limiting mechanism) capable of moving in and out of the intermediate presser lifting return arm held by the solenoid 54. 52 between the front end and the protruding part 45d, and can be used to prevent the middle presser foot lifting return arm 52 from contacting the protruding part 45d. That is, in order to maintain the position of the intermediate presser 29, the shielding plate 55 can be moved between the front end of the intermediate presser lift return arm 52 and the protrusion 45d when it is not desired to rotate the intermediate presser lift cam 45. the

Here, the positional relationship between the intermediate presser 29 and the outer presser 104 will be described. the

As shown in FIG. 8 , the position where the intermediate presser 29 stands by during sewing is called the intermediate presser lower position P4 , and the position where the intermediate presser 29 withdraws upward after sewing is called the intermediate presser retracted position P5 . In addition, the position where the outer presser 104 presses the sewing product during sewing is called the outer presser lower position, and the position where the outer presser 104 retreats after sewing is called an outer presser upper position. the

These positional relationships are such that the height from the needle plate 101 decreases in the order of the intermediate presser retracted position P5, the outer presser upper position, the intermediate presser lower position P4, and the outer presser lower position. the

(Motion of intermediate presser during sewing)

Next, the operation of the intermediate cloth pressing device 1 having the above-mentioned configuration will be described. the

When the upper shaft motor is driven (illustration omitted) and the eccentric cam 3 is rotated, the front end of the connecting rod 4 is connected in a direction substantially perpendicular to the axis of the upper shaft 2 (relative to the third connecting rod 20 and the fourth connecting rod 22). The inline direction D2 transverse direction D3) rocks, and the rocking shaft abutment 5 that is connected on the connecting rod 4 also rocks in the same direction. By the rocking of the rocking shaft abutment 5, the rocking shaft 6 also rocks, therefore, one end portion of the first connecting rod 8 becomes a rocking fulcrum and the other end portion of the first connecting rod 8 is along a direction substantially perpendicular to the axis of the rocking shaft 6 ( It swings in a direction D3) transverse to the in-line direction D2 of the third link 20 and the fourth link 22 . With the rocking of the other end of the first connecting rod 8, the other end of the second connecting rod 11 rocks along the in-line direction D2 of the third connecting rod 20 and the fourth connecting rod 22, and is connected to the other end of the second connecting rod 11. The third link 20 and the fourth link 22 at one end swing along the straight direction (vertical direction) D2 thereof. As the third link 20 and the fourth link 22 swing, the intermediate presser rod 28 connected to the fourth link 22 moves downward in the vertical direction D1, and therefore the intermediate presser 29 also moves in the vertical direction. the

(Adjustment of the lower position of the middle presser foot of the middle presser device)

Next, the adjustment operation of the intermediate presser foot lower position P4 of the intermediate presser device 1 having the above-mentioned configuration will be described. the

After the motor 42 is driven, the drive of the motor 42 is transmitted to the movable shaft 39 through the bevel gear 41 and the bearing 40, and the movable shaft 39 starts to rotate. By the rotation of the movable shaft 39, the eccentric cam 38 is also rotated, and the moving link 36 is moved in a direction substantially perpendicular to the axis of the movable shaft 39 (transverse to the straight direction D2 of the third link 20 and the fourth link 22). Direction D3) Shake. By swinging the moving link 36 , the guide member 34 swings in a direction D3 transverse to the straight direction D2 of the third link 20 and the fourth link 22 . the

At this time, as shown in FIG. 9, the segmented screw 23 of the connecting portion P3 of the third link 20 and the fourth link 22 connected to the elongated hole 34a of the guide member 34 restricts the direction of its threaded part through the elongated hole 34a. Relative to the movement of the direction D3 transverse to the in-line direction D2 of the third link 20 and the fourth link 22, the force transmitted by the shaking has nowhere to go, and the segmented screw 23 moves upward along the long hole 34a. As the segment screw 23 follows the movement of the guide member 34, the angle θ formed between the third link 20 and the fourth link 22 connected side by side changes, and the intermediate presser link member 24 becomes roughly in the shape of a "く". . When the intermediate presser link member 24 has a substantially "く" shape, the distance L between the joint ends of the intermediate presser link member 24, in other words, the distance L between one end of the third link 20 and the fourth link 22 The distance L between the other ends of the pins becomes shorter, and the intermediate presser 29 moves upward along the up-down direction D1. Thereby, the intermediate presser lower position P4 of the intermediate presser 29 can be adjusted. the

(The retraction action of the intermediate presser by the intermediate presser device) 

Next, the operation when the intermediate presser 29 is moved to the intermediate presser retreat position P5 after the sewing is completed will be described. the

The adjustment of the lower position P4 of the intermediate presser is carried out by adjusting the ratio of each link and rotating the motor 42 within the range of 0° to 180°, and the retraction of the intermediate presser 29 is carried out by making the motor 42 within the range of 180° to 360° Rotate and proceed. the

That is, when adjusting the lower position P4 of the intermediate presser foot, if the motor 42 is rotated within the range of 0° to 180°, the maintenance portion 45a of the intermediate presser lifter cam 45 abuts against the roller 47, and the intermediate presser foot 29 When retracting, if the motor 42 is rotated within the range of 180° to 360°, the variable portion 45b of the intermediate presser lifting cam 45 is brought into contact with the roller 47 to connect the respective portions. the

Therefore, as shown in FIGS. 5 to 7 , since the motor 42 rotates within the range of 0° to 180° during sewing, the maintaining portion 45 a abuts against the roller 47 and the intermediate presser lifting member 46 does not rotate. Therefore, the intermediate presser lifting member 46 does not push the intermediate presser rod abutment 27 upward, and only the intermediate presser lower position P4 can be adjusted. However, when the motor 42 is rotated in the range of 180° to 360° after sewing is completed, the variable portion 45b abuts against the roller 47 and presses one end of the intermediate presser lifting member 46 downward. Then, the intermediate presser lifting member 46 rotates with the pin 48 as a fulcrum, and the other end of the intermediate presser lifting member 46 moves upward, and pushes upward the intermediate presser rod abutment 27 provided on the moving path. Thereby, the intermediate presser 29 can be raised to the intermediate presser retreat position P5. the

(The movement of the intermediate presser foot when the power of the sewing machine is cut off)

Next, the operation when the intermediate presser 29 is raised and lowered after the sewing is completed will be described. the

When the power of the sewing machine 100 is turned off and the intermediate presser 29 is located at the intermediate presser retreat position, when the power of the sewing machine 100 is turned off, the power of the solenoid 54 is also turned off. When the power supply of the solenoid 54 is cut off, since the holding of the intermediate presser lift return arm 52 is released, the intermediate presser lift return arm 52 is pushed toward the protruding portion 45d of the intermediate presser lift cam 45 by the elastic force of the coil spring 53. ejected. Then, when the intermediate presser lift return arm 52 abuts against the protruding portion 45d, the kinetic energy of the intermediate presser lift return arm 52 is transmitted to the protruding portion 45d, and the protruding portion 45d starts to rotate clockwise in FIG. 5 . the

Here, when the intermediate presser 29 is located at the intermediate presser retreat position P5, the changing portion 45b of the intermediate presser lift cam 45 abuts against the roller 47, and the distance from the rotation center of the intermediate presser lift cam 45 to the maintenance portion 45a is adjusted. The distance is different from the distance to the changing portion 45b, so, as shown in FIG. Variety. Thereby, when the protruding portion 45d starts to rotate, the intermediate presser lifting cam 45 can rotate slowly even without applying a rotational force thereafter. Thereafter, as described above, by the rotation of the intermediate presser foot lifting cam 45, and the abutment position of the roller 47 is changed from the changing portion 45b to the maintaining portion 45a, so the intermediate presser foot lifting member 46 follows the reverse direction of FIG. The clockwise direction starts to rotate, and the intermediate presser 29 descends to the lower position P4 of the intermediate presser. This mechanism is a movement control mechanism (movement control mechanism of the present invention) that operates the lifting drive mechanism so that the intermediate presser moves to the lower position of the intermediate presser. the

On the other hand, after the power of the sewing machine 100 is turned off, it is desirable to move the shielding plate 55 between the protruding portion 45d and the intermediate presser lifting return arm 52 while maintaining the intermediate presser 29 at the intermediate presser retreat position P5. As a result, the power supply of the solenoid 54 is cut off, the intermediate presser lifting return arm 52 is pushed out toward the protrusion 45d, and the intermediate presser lifting return arm 52 collides with the shield plate 55 and is restricted from moving to the protrusion 45d. The intermediate presser 29 can be maintained at the intermediate presser retracted position P5 without rotating the presser lifting cam 45 . This mechanism is a movement restricting mechanism (movement restricting mechanism of the present invention) that restricts the control operation of the above-mentioned elevation drive mechanism by the above-mentioned movement control mechanism. the

(action effect of embodiment 1)

According to the middle presser device 1 of the sewing machine of Embodiment 1, when the power of the sewing machine 100 is cut off, when the outer presser foot that can be retracted to the predetermined position retracts to the above-mentioned predetermined position, the middle presser lifts the return arm 52, and passes through the middle presser. The protruding part 45d of the foot lifting cam 45 abuts and rotates the intermediate presser foot lifting cam 45, which can move the intermediate presser foot 29 to the position P4 under the intermediate presser foot, and does not cause the intermediate presser foot 29 to become an obstacle for the needle bar to descend. The needle bar cannot descend, or cannot pass the suture thread on the machine needle 107. In addition, when the power of the sewing machine 100 is turned off, the shielding plate 55 restricts the rotation of the intermediate presser lifting cam 45 by the intermediate presser lift return arm 52, so that the intermediate presser 29 can be maintained at the intermediate presser retreat position P5 without The intermediate presser foot 29 may become an obstacle to mounting, and may come into contact with the presser frame 105 (see FIG. 1 ) when descending, thereby causing damage to the presser frame 105 . Therefore, the operability after the power supply of the sewing machine 100 is turned off can be improved.

Example 2

(The composition of the middle cloth pressing device)

The middle cloth pressing device 1G of the second embodiment, as shown in FIGS. 2 , 10 and 11 , replaces the movement control mechanism and the movement restriction mechanism of the first embodiment, and controls the middle presser foot 29 through the control device 90 . In addition, since the components other than the control device 90 are the same as those in the first embodiment, they are denoted by the same symbols and their descriptions are omitted. the

As shown in FIG. 11 , the control device 90 includes a CPU 91 that performs various processes, and a memory 92 as a storage means for storing programs and data. the

A memory 92 is formed of a work area 93 for processing by the CPU 91 , a data area 94 for recording data for processing, and a program area 95 for storing programs for various operations in the middle cloth press device. the

In the data area 94 , intermediate presser position data 94 a corresponding to the intermediate presser retracted position P5 and intermediate presser down position P4 and the driving amount of the motor 42 are stored. Specifically, the rotation angle of the shaft of the motor 42 required to move the intermediate presser 29 to the intermediate presser retreat position, and the rotation angle of the shaft of the motor 42 required to move the intermediate presser 29 to the intermediate presser position data 94a are stored in the intermediate presser position data 94a. The rotation angle of the shaft of the motor 42 required for the foot position. the

In the program area 95 , a drive control program 95 a for controlling the drive of the motor 42 based on the intermediate presser foot position data 94 a stored in the data area 94 is stored. That is, the control device 90 functions as a drive control unit that executes the drive control program 95 a by the CPU 91 . the

(The movement of the intermediate presser foot when the power of the sewing machine is cut off)

Next, the control of the control device 90 when the intermediate presser 29 is raised and lowered after the sewing is completed will be described. the

When there is an intention to set the intermediate presser foot 29 at the lower position P4 of the intermediate presser foot, when the control device 80 detects that the power supply of the sewing machine 100 is cut off, the electric power holding device (for example, a capacitor) built in the control device 80 is used. The electric power rotates the shaft of the motor 42 based only on the amount of the intermediate presser foot position data 94a. The driving force of the motor 42 is transmitted to the intermediate presser lift cam 45 through the bevel gears 41 and 43, and the intermediate presser lift cam 45 moves clockwise as shown in FIGS. Angle rotation in . the

Here, when the intermediate presser 29 is located at the intermediate presser retreat position P5, the changing portion 45b of the intermediate presser lift cam 45 abuts against the roller 47, and the distance from the rotation center of the intermediate presser lift cam 45 to the maintaining portion 45a The distance to the change portion 45b is different, so, as shown in FIG. 9, when the abutment position with the roller 47 is changed from the change portion 45b to the maintenance portion 45a, the abutment position with the roller 47 gradually occurs. Variety. Thereby, the intermediate presser lift cam 45 starts to rotate, and thereafter, the intermediate presser lift cam 45 can rotate slowly even without applying a rotational force. Thereafter, as described above, through the rotation of the intermediate presser lifting cam 45, the contact position with the roller 47 is changed from the changing portion 45b to the maintaining portion 45a. ~ The counterclockwise rotation in Fig. 7 starts, and the intermediate presser 29 descends to the lower position P4 of the intermediate presser. the

On the other hand, when there is an intention to set the intermediate presser 29 at the intermediate presser retreat position P5, the control device 80 controls the motor 42 so as not to transmit a signal to drive the motor 42, so that the motor 42 is stopped. In the state where the intermediate presser lifter cam 45 does not rotate, the intermediate presser 29 can be maintained at the intermediate presser retracted position P5. the

That is, the middle cloth pressing device of the sewing machine according to Embodiment 2 has a lifting drive mechanism for moving the above-mentioned middle presser up and down along the vertical movement direction of the machine needle, and a driving mechanism for actuating the above-mentioned lifting driving mechanism, and has:

storage means for storing intermediate presser position data corresponding to the retracted position of the intermediate presser, the lower position of the intermediate presser and the driving amount of the driving mechanism, and

A drive control unit that controls the drive unit based on the intermediate presser foot position data stored in the storage unit when the sewing machine is powered off. the

(action effect of embodiment 2)

According to the intermediate presser device 1G of the sewing machine of Embodiment 2, the CPU 91 of the control device 90 executes the drive control program 95a to cause the motor 42 to operate 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 retracted position P5, the intermediate presser 29 can be moved to the intermediate presser retracted position P5 without occurrence of an intermediate presser. The presser foot 29 becomes an obstacle to mounting, and may come into contact with the presser frame 105 (see FIG. 1 ) when descending, thereby damaging the presser frame 105 . Furthermore, when the control device 90 rotates the shaft of the motor 42 so as to output a driving amount corresponding to the intermediate presser retreat position P5, the intermediate presser 29 can be moved to the intermediate presser lower position P4 without generating intermediate pressure. The foot 29 becomes an obstacle for the descent of the needle bar, thereby causing the situation that the needle bar cannot descend or cannot pass the suture thread on the machine needle 107 . Therefore, operability after turning off the power of the sewing machine 100 can be improved. the

In addition, this invention is not limited to the said Example. For example, the lifting of the intermediate presser foot 29 after the power supply of the sewing machine 100 is cut off may not require a device built into the sewing machine 100, and the installation of the intermediate presser foot 29 from the outside of the sewing machine can move the intermediate presser foot 29 to the retracted position P5 and The intermediate presser foot driving part is configured in such a way that the intermediate presser foot lower position P4, and the intermediate presser foot 29 is moved by the operator's manual operation. 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 retreat position P5 and the intermediate presser lower position P4. Here, when the intermediate presser 29 is moved to the intermediate presser retracted position P5 by the operation of the intermediate presser foot driving member, the intermediate presser 29 does not become an obstacle to installation and contact the presser frame 105 when it is lowered. When the pressure frame 105 is damaged. And, when the middle presser foot 29 is moved to the position P4 under the middle presser foot by the operation of the middle presser foot driving part, the middle presser foot 29 will not become an obstacle to the descent of the needle bar, thereby causing the needle bar to fail to descend, or to prevent the needle bar from falling. A situation where the suture cannot pass through the needle 107. Therefore, operability after turning off the power of the sewing machine 100 can be improved. the

The number, connection positions, and connection order of the links constituting the intermediate presser swing mechanism M1 are arbitrary, and the mechanism can be freely changed as long as it can output swinging in the vertical direction D1 of the intermediate presser 29 . the

In addition, in the embodiment, in order to obtain the required intermediate presser foot lower position P4, necessary data is stored in the control device 90, but the driving amount of the motor 42 can also be set by the operator according to the sewing situation. the

In addition, even if the intermediate presser lifting cam 45 and the intermediate presser lifting member 46 are not provided, the output shaft of the motor 42 can be off-centered to move the intermediate presser 29 to the intermediate presser retreat position P5. the

Claims (1)

1. A middle cloth pressing device of a sewing machine, which has a middle presser foot, and when the needle is pulled out from a sewing product held by an outer presser foot, it is connected to the said sewing product in a manner of pressing the sewing product. The needle moves up and down synchronously and moves up and down, When the outer presser that can be retracted to a predetermined position when the power of the sewing machine is turned off is retracted to the predetermined position, the intermediate presser can move above the retracted outer presser when the power is turned off. One of the intermediate presser retracted position and the lower position of the intermediate presser that can press the sewing product, the intermediate presser device of the sewing machine is characterized in that it has: Lifting drive mechanism for lifting and lowering the intermediate presser foot; a motor as a driving mechanism for operating the lifting driving mechanism; a storage mechanism that stores intermediate presser position data in which the retracted position of the intermediate presser and the lower position of the intermediate presser correspond to the driving amount of the motor; As a control device of the drive control mechanism, the control device controls the motor based on the intermediate presser foot position data stored in the storage device when the power of the sewing machine is turned off, The control device controls the intermediate presser according to the intermediate presser position data when it is intended to set the intermediate presser at the position below the intermediate presser when it is detected that the power supply of the sewing machine is cut off. The motor makes the position of the intermediate presser the lower position of the intermediate presser, and when there is an intention to set the intermediate presser at the retracted position of the intermediate presser, it controls the presser according to the position data of the intermediate presser. the motor, so that the position of the intermediate presser is the retracted position of the intermediate presser. the

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