JPH07504576A - Sewing machine with rotationally driven upper feed means - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] A sewing machine equipped with a rotationally driven upper feeding means The present invention is based on the prerequisite concept of claim 1. The present invention relates to a sewing machine equipped with an upper feeding means that is mounted and driven one revolution.

The upper feed means, which is provided to assist in feeding the sewing product, is driven by the upper shaft of the sewing machine. or by either a separate drive motor.

The upper feed means is driven by the upper shaft of the sewing machine or a drive shaft linked to the upper shaft. In order to carry out the backward feed movement, the drive of the upper feed means must be operated by appropriate means. Separate the upper feeding means from the upper feeding means using a step, or conversely, connect the upper feeding means to the drive device. must be separated from it.

According to German Patent No. 3008135, it is possible to Upper feeding means are known. In the case of this known upper feeding means, the forward feeding The components of the drive connection for producing the forward and reverse feed movements are the switching clamps. This is a reversing transmission equipped with radial serrations.

The widely used sewing machine (Adler 268 PA-45AR2) has a key A drive for the caster is provided. With this drive, the freewheel A swinging lever with a loop portion drives a first gear provided on the support member.

This first gear meshes with a second gear connected to the caster. child In this case, the supporting member is supported so as to be able to pivot outwardly on a caster carrier. first The gear meshes with the gear of the backward motion prevention part, which is connected to the switching bush. ing. A Bauden wire is connected to the stitch adjustment lever. When the ear is switched from a forward stitch to a backward stitch, the ear is First, move the switching bush forward, so that it meshes with the gear of the backward motion prevention part. The support member is then rotated to connect the first gear and the gear provided on the caster. release the mesh. In this way, the drive of the caster is the driven gear. It is interrupted by removing it from the transmission system.

This configuration is complex and the switching process may be too sudden or too slow. Moreover, the disadvantage is that it takes up a lot of space.

If the upper feed means are driven by a separate drive motor, the backward stitch The drive direction of the drive motor is reversed when This must be done synchronously or the drive of the upper feed means must be stopped.

German Patent No. 3516715 discloses a stepping motor as an upper feeding means. A configuration is disclosed that uses casters that are separately driven by motors. this The casters are rotatable outward and supported movably in the height direction, It is fixed to the stepping motor drive shaft. Caster drive is not stopped. However, the direction of rotation can be reversed by reversing the driving direction of the stepping motor. It is possible to transfer

An object of the present invention is to configure a sewing machine equipped with a rotationally driven feeding means as follows. In particular, when interrupting the driving of the feeding means, press the feeding means with a uniform pressing force and two It can be freely rotated in the direction of rotation and left on the sewing material, and the installation location and customs of the device The switching process is soft, and continuous switching cannot be performed frequently. The goal is to configure the system so that it can be done.

The above problem is solved in the sewing machine according to the prerequisite concept of claim 1. resolved by minutes.

According to the invention, whether the feeding means are coupled or uncoupled, Axial forces can be transmitted, so that the feed means can maintain a predetermined value even in the uncoupled state. It can be placed on the sewing product by pressing force.

According to the structure according to claim 2, in order to lift the feeding means from the sewing material, the driving means is Instead of moving the entire device, you can simply move the driven part in the axial direction. -Features another effect: The structure according to claim 3 allows the axis of the driven part and the axis of the driving part to be aligned as specified. can be related to.

The arrangements according to claims 4 and 5 require only a small amount of space in the radial direction. Therefore, the inner and outer diameters of the driving part and the driven part can be made relatively small. .

If a pressure medium duct for energizing the pressure medium piston is provided in the drive shaft (as requested) Item 7) is advantageous because it does not take up much space and is lightweight.

Next, one embodiment of the present invention will be described using the accompanying drawings.

FIG. 1 is a partial sectional view of the drive device of a sewing machine according to the present invention, which is equipped with casters. , Figure 2 is a sectional view taken along line m-n of the switching clutch of the drive device in Figure 1; Figure 3 is a partial side view of the drive device in Figure 1, Figure 4 is a configuration diagram of the caster, It is.

The drive device shown in Figure 1 can be securely fixed to the drive shaft 1 and the sewing machine head. A swivel bearing 2 supporting a drive shaft 1 at a drive shaft and a drive block having a freewheel section. 3 (one-way clutch) and a helical spring placed on the caster side of the drive shaft 1. Switching clutch (Scbal+k) with 7 (Schlingfeder) uplung). A connecting rod 4 is engaged with the drive bush 3.

The connecting rod 4 is provided on a swing arm 6 provided on a spline shaft 5 of the sewing machine. Ru.

The drive part 8 of the switching clutch is a sleeve that is fixed to the drive shaft 1 . pickpocket The caster 8 has a driven part 9 which is connected to the caster 24 via a transmission. It is set up. A shoulder is formed on the inside of the driven part 9.

The driven part 9 surrounds the sleeve 8 in the form of a sheath and in this way It is supported by 8. The central element of the switching clutch is the helical spring 7.

The end of the helical spring 7 is bent to form an end member 10 that is parallel to the axis. One end of the helical spring 7 provided with this end member 10 is provided with an elongated hole 14. It is fixed to the first disc 11. The first disk 11 has a screw pin 12 (see FIG. ) in the drive part 8. The end 10a of the helical spring 7 The other end thereof is fixed to a second disc 13 having an elongated hole 14. Second, the disk 13 is rotatably arranged within the driven part 9. Elongated hole 1 in both discs 11 and 13 4 is advantageously provided with chamfers on both sides.

The outer diameter of the helical spring 7 surrounds this helical spring 7 in a relaxed state. It is slightly larger than the inner diameter of the driving part 8 and the driven part 9 that contain the inner diameter.

The driven end of the helical spring 7 is twistable relative to the driving end.

For this purpose, the flat piston is guided through the elongated hole 14 of both discs 11.13. A rod 15 is used. The flat piston rod 15 is twisted spirally on the driven side, and the shaft It is possible to move in the direction.

The flat piston rod 15 is fixed to the piston 16 on the drive side. The piston 16 The holder is guided in a form-constrained manner in the drive part 8 and is arranged in the drive shaft 1. It is subjected to a compressive action through the duct 17. This allows the flat piston rod 15 to be It can be moved in the direction. The action of the compressed air is controlled by a control installed outside the device. a controllable valve, a supply pipe 18 and an annular groove 20 provided in a stationary top-up member 19. It is done through The packing ring 21 provided in the replenishment member 19 has pressure characteristics. It serves to maintain a certain level of gender.

The driven part 9 carries at its lower end a slitted pole head 22.

The pole head 22 engages a caster device 23 of known construction. caster The device 23 transmits the rotary movement of the driven part 9 to the caster 24 via a helical transmission. I can do it. A bevel gear connected to the caster 24 is driven by the pawl head 22. and is driven by eccentrically meshing pinions.

The switching clutch prevents the caster 24 from being lifted from the sewing material even during sewing operations. The drive of the casters 24 can be stopped immediately.

The drive shaft 1 (and thus also the drive part 8 of the switching clutch) is connected to a splined shaft 5 The movement of the swinging arm 6 and the connecting rod 4, which are Intermittent drive bushings 3, each equipped with a one-way clutch, are arranged as shown in FIG. driven by Both drive bushes 3 perform drive when rotating clockwise and vice versa. When rotating clockwise, it rotates due to inertia. Therefore, drive shaft 1 is always in one direction. Receives rotation pulse. This rotation pulse acts as a force restraint when the clutch is released. Driven part 9 with a ball head 22 with a slit via a helical spring 7 and thus to the caster device 23 provided with the casters 24.

The force-restricting connection between the helical spring 7 and the driven part 9 of the switching clutch is released. When this happens, the driving of the casters 24 is interrupted. Uncoupling is wrapped around This is done by reducing the outer diameter of the helical spring 7. The outer diameter of the helical spring 7 Reduction is achieved by moving the flat piston rod 15 in the axial direction and rotating the disc 13. Let's go.

For this purpose, the pressure medium piston 16 is energized by compressed air, and the pressure medium piston 16 is Move it downward (Figure 1-).

This causes the driven part 9 (and thus also the caster 24) to move away from the drive shaft 1.

When the piston 16 is released, the helical spring 7 relaxes and the piston 16 moves upward again, the helical spring 7 comes into contact with the force restraining force, and as a result, the drive shaft 1 The rotational motion is transmitted to the caster 24. If the drive of the caster 24 is interrupted, the driven Part 9 (and thus also caster 24) can rotate freely in two rotational directions. Ru.

The caster device 23 uses a leaf spring at the end opposite to the sewing material to support the sewing material. The fabric presser bar 25 is placed on the fabric presser bar 25, which is pressed against the It can be lifted from the sewing item together with the lifting rod 25. In this case, caster device 2 3 is pushed towards the drive, causing it to move upwards together with the drive bush 3 .

Copy and translation of written amendment) Submission (Article 184-8 of the Patent Law) February 20, 1992 Day Wataru Fukasawa, Commissioner of the Patent Office, Masanori 1. International application number PCT/EP 90101367 2. Name of the invention Sewing machine 3 with rotationally driven upper feed means, patent applicant Address: Day 6750, Kaiserslautern Königs, Federal Republic of Germany Utrace 154 Name: D.M. Buff. Nationality: Federal Republic of Germany. 6. List of attached documents (1) Copy and translation of the written amendment) 1 copy (1) "Specification..." written from page 1, line 1 to page 4, line 19 of the translated specification. ...is... ” has been amended as follows: A sewing machine equipped with a rotationally driven upper feeding means The present invention is based on the prerequisite concept of claim 1. The present invention relates to a sewing machine equipped with a rotatably driven upper feeding means mounted on the sewing machine.

The upper feed means, which is provided to assist in feeding the sewing product, is driven by the upper shaft of the sewing machine. or by either a separate drive motor.

The upper feed means is driven by the upper shaft of the sewing machine or a drive shaft linked to the upper shaft. In order to carry out the backward feed movement, the drive of the upper feed means must be operated by appropriate means. Separate the upper feeding means from the upper feeding means using a step, or conversely, connect the upper feeding means to the drive device. must be separated from it.

Driven by a step switching device according to German Patent No. 30081.35 Upper feeding means are known. In the case of this known upper feeding means, the forward feeding The components of the drive connection for producing the movement and the retraction movement are It is a reversing transmission equipped with a latch (radial serration).

The widely used sewing machine (Adler 268 FA-43Al1) has a key. A drive for the caster is provided. With this drive, the freewheel A swinging lever with a loop portion drives a first gear provided on the support member.

This first gear meshes with a second gear connected to the caster. child In this case, the supporting member is supported so as to be able to pivot outwardly on a caster carrier. first The gear meshes with the gear of the backward motion prevention part, which is connected to the switching bush. ing. A Bauden wire is connected to the stitch adjustment lever. When the ear is switched from a forward stitch to a backward stitch, the ear is First, move the switching bush forward, so that it meshes with the gear of the backward motion prevention part. The support member is then rotated to connect the first gear and the gear provided on the caster. release the mesh. In this way, the drive of the caster is the driven gear. It is interrupted by removing it from the transmission system.

This configuration is complex and the switching process may be too sudden or too slow. Moreover, the disadvantage is that it takes up a lot of space.

If the upper feed means are driven by a separate drive motor, the backward stitch The drive direction of the drive motor is reversed when This must be done synchronously or the drive of the upper feed means must be stopped.

German Patent No. 3516715 discloses a stepping motor as an upper feeding means. A configuration is disclosed that uses casters that are separately driven by motors. this The casters are rotatable outward and supported movably in the height direction, It is fixed to the stepping motor drive shaft. Caster drive is not stopped. However, the direction of rotation can be reversed by reversing the driving direction of the stepping motor. It is possible to transfer

In addition to the presser foot, in order to improve the transport of the sewn product, the needle is The use of separately driven rollers located behind the It is known from the publication No. 2819696.

This roller, the so-called puller roller, rotates in synchronization with the feeder and moves intermittently. Implement. The needle stops when it is inserted into the product. Its drive is controlled separately. This is done via a deflectable shaft by an electric motor. For backward stitches, move forward ・Using the reverse lever Σ2 rims LNp color cutting" Furthermore, from European Patent Publication No. 0138218, two The person who received the two transport plates, J-class L1 and Yu” ≦ Koko bar and 澾 - ≦≧λΩ! ! ffi On the other hand, a clamp clutch or friction clutch is used to interrupt the drive. This switching clutch is connected to the drive unit using a switching clutch configured as The clutches are arranged on two coaxial shafts, and there are two? has a sleeve These sleeves are movable axially relative to each other, but their respective axes The clamps are mounted so that they cannot rotate relative to each other, and are opposed to each other so that they can contact each other. Equipped with a ramp clutch or friction clutch.

U.S. Patent Nos. 3,726,372 and 3,990,554 disclose mutually coaxial and a helical spring as a clutch element between two bosses arranged on the end face side. The helical spring type clutch with the If force" [4 black 1"] 1 - determine the degree of twist, and Connected to the boss by the operating sleeve surrounding the spring. An object of the present invention is to configure a sewing machine equipped with a rotationally driven feeding means as follows. In particular, when interrupting the driving of the feeding means, press the feeding means with a uniform pressing force and two It can be freely rotated in the direction of rotation and left on the sewing material, and the installation location and customs of the device The switching process is soft, and continuous switching cannot be performed frequently. The goal is to configure the system so that it can be done.

The above problem is solved in the sewing machine according to the prerequisite concept of claim 1. resolved by minutes.

According to the invention, whether the feeding means are coupled or uncoupled, Axial forces can be transmitted, so that the feed means can maintain a predetermined value even in the uncoupled state. It can be placed on the sewing product by pressing force.

According to the structure according to claim 2, in order to lift the feeding means from the sewing material, the driving means is Instead of moving the entire device, you can simply move the driven part in the axial direction. It features another effect called The structure according to claim 3 allows the axis of the driven part and the axis of the driving part to be aligned as specified. Therefore, the inner diameter of the driving and driven parts and and outer diameter can be made relatively small.

If a pressure medium duct for energizing the pressure medium piston is provided in the drive shaft (as requested) Item 7) is advantageous because it does not take up much space and is lightweight.

Next, one embodiment of the present invention will be described using the accompanying drawings.

FIG. 1 is a partial sectional view of the drive device of a sewing machine according to the present invention, which is equipped with casters. .

Figure 2 is a sectional view taken along line n-n of the switching clutch of the drive device in Figure 1; Figure 3 is a partial side view of the drive device in Figure 1, Figure 4 is a configuration diagram of the caster, It is. ” Copy and translation of amendment) Submission statement (Article 184-7, Paragraph 1 of the Patent Act) 1992 2 20th of the month

Claims (1)

[Claims] 1. It has an upper feeding means that is rotatably driven, and a clamp is used to switch the driving movement of the feeding means. In a sewing machine in which the switching clutch is generated by the drive shaft through the the drive part (8) of the drive shaft is formed by a sleeve arranged at the end of the drive shaft; The sleeve is rotated via a clutch element (7) configured as a helical spring. It can be connected in a force-restricted manner to the driven part (9) arranged coaxially with the leaf, and the driving part The force restraint between the part (8) and the driven part (9) changes the degree of twist of the helical spring. It can be controlled by the movement of the switching member (15) in the axial direction. Featured sewing machine. 2. The driving part (8) and the driven part (9) are arranged so as to be movable relative to each other in the axial direction. The sewing machine according to claim 1, characterized in that: 3. The driven part (9) surrounds the driving part (8) in the form of a jacket tube. The sewing machine according to claim 1 or 2. 4. One end of the helical spring (7) is fixed in the drive part (8) with an elongated hole (14). The helical spring (7) The second end has an elongated hole (14) and is rotatably arranged in the driven part (9). It must be fixed to the disc (13) of No. 2, and the elongated hole (14) of both discs (11, 13) The flat piston rod (15 ) according to any one of claims 1 to 3, characterized in that: Sewing machine included. 5. The pressure medium piston (16) is guided in a constraint manner in the drive shaft (1). Claim characterized in that the flat piston rod (15) is axially movable through the The sewing machine according to item 1, 2 or 4. 6. A first disk (11) with an elongated hole (14) is driven by a pin (12). (8) according to claim 1 or 2 or 4, characterized in that it can be fixed within the sewing machine. 7. A pressure medium in the drive shaft (1) for biasing the pressure medium piston (16) Claim 1 or 2 or 5, characterized in that a duct (17) is arranged. The sewing machine described in 8. The rotationally driven feeding means is connected to the sewing machine in a known manner via a lever mechanism. claim, characterized in that it is arranged on a presser rod (25) that can be lifted from the The sewing machine according to any one of items 1 to 7.