JPH0720516B2 - Automatic sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is an automatic stitching machine that moves a cloth holder holding a cloth to a shape defined by a storage element such as a PROM to obtain a seam of a constant shape. It is about sewing machines.

[Prior Art] A conventional automatic sewing machine attaches a sewn product to a cloth pressing device,
This sewn product is set so as to match the position of the sewing needle of the sewing machine main body, and then the cloth pressing device is moved along the trajectory of the horizontal plane to perform sewing in accordance with a predetermined pattern. That is, in the operation of the cloth pressing device in this kind of automatic sewing machine, the operator first places the sewing machine in a stopped state and puts the sewn product at a predetermined position on the cloth pressing device, and operates the cloth pressing switch to move the sewn product. Hold the work clamp device. Next, operate the sewing machine start switch to start sewing the sewing machine, move the work clamp device to complete sewing of the specified pattern, and then release the holding of the sewn product by the work clamp device and press the completed work clamp. It was removed from the device and the next sewn product was set in the cloth pressing device in the same manner as described above.

[Problems to be Solved by the Invention] In the above-described conventional cloth pressing device, the sewing machine must be stopped in order to set the sewing article on the cloth pressing device. Further, since it is necessary to set the sewn product so as to match the predetermined position of the work clamp device in order to form the stitches according to the predetermined sewing pattern on the sewn product, it takes time to set the sewn product. , The sewing machine stops for a long time. Further, when sewing the edge of the sewn product, the position for setting the sewn product has to be particularly accurate, which further lengthens the set time, leading to a decrease in operating rate and productivity. . If the position of the sewn product is not set correctly with respect to the work clamp in order to shorten the time for setting the sewn product, the seam may be dislocated from the predetermined position of the sewn product, resulting in deterioration of quality. is there.

The present invention has been made to solve such problems, and improves the structure of the presser foot device in an automatic sewing machine,
An automatic sewing machine that allows easy attachment and detachment of sewn items and enables the sewing machine to set the next sewn item during sewing to reduce the attachment and detachment time of sewn items and improve productivity. Aim to get.

[Means for Solving the Problems] The present invention has been made in order to achieve this object, and includes a moving table which is moved by a conveying driving means along a slide plate provided on a sewing surface of a sewing machine body, A plurality of engagement arms provided on the movable table and driven by the engagement drive means, and a plurality of engagement arms detachably engaged with the plurality of engagement arms and conveyed on the sliding plate by the movable table to sequentially perform sewing. A plurality of cloth holders positioned at the sewing position of the drive device and switched and connected to the presser arm, and the working end provided on the bottom surface of the sliding plate is projected through the hole of the sliding plate to the upper surface and retracted from the sewing position. And an opening driving means for releasing the holding of the cloth holder.

[Operation] In the present invention, while one workpiece of the plurality of cloth cages is being sewn, the other workpiece cage is made to hold the next workpiece, and When sewing is completed, the cloth holder transporting device can be driven to replace the cloth holder for which sewing has been completed with the cloth holder on which the sewn product has been set.

[Embodiment] FIG. 1 is a perspective view showing the overall construction of an embodiment of the present invention. In the figure, (1a) is a sewing machine head which laterally projects at the top of the sewing machine body (1) and is equipped with a sewing needle at the tip, and (2) is a cloth holder (4) which will be described later according to preprogrammed sewing pattern data. And (5) slide plate (3)
Presser arms of a drive device that is moved up and down, left and right while being pressed upward, (2a) and (2b) are positioning pins (3) provided on the presser arm (2) for holding the cloth retainers (4) and (5). )
Is a sliding plate fixed to the sewing machine main body (1).
(4) is a first cloth retainer for holding a cloth (34) which is a sewn product, and (4a) and (4b) are fitting the positioning pins (2a) and (2b) into the recesses provided in this. By doing so, positioning blocks for integrally connecting the presser arm (2) and the first cloth retainer (4), (4c), (4d) are engaging arms (7), which will be described later,
(8) A positioning block for integrally fixing the movable table (6) and the first cloth holder (4).

Next, (5) is the second cloth retainer (4) having the same structure as the first cloth holder (4).
In the cloth retainer of (5a) and (5b), the positioning pins (2a) and (2b) of the presser arm (2) are fitted in the recesses of the presser arm (2) and the second cloth retainer. Positioning blocks for integrally connecting (5), (5c), (5d) connect the movable table (6) and the second cloth retainer (5) by engaging arms (15), (16) described later. It is a positioning block that is integrally fixed.

Next, (4g) and (5g) are cloth holders (4) and (5), respectively.
Is a lid that is openably and closably connected by hinges (4e), (4f) and (5e), (5f), holds the cloth in the cloth holder when closed, and allows the cloth to be taken in and out when opened. The lids (4g) and (5g) have an opening for sewing at the center. Reference numeral (6) is a movable base which can be moved left and right along the rail (23). (7) and (8) are swingably supported by blocks (9) and (10), respectively, and are connected to an air cylinder (13) via a shaft (11) and a knuckle (12). The engaging arm that rocks by the operation of (13) and locks or unlocks the first cloth retainer (4), and (14) is fixed to the moving base (6) to move the air cylinder (13). It is a support base to support. Similarly, (15) and (16) are swingably supported by blocks (17) and (18), respectively, and connected to an air cylinder (21) via a shaft (19) and a knuckle (20) to swing. An engagement arm that locks or unlocks the second cloth retainer (5) by being driven, and (22) is a support base that is fixed to the moving base (6) and supports the air cylinder (21). . (24), (2
5) is a support plate for fixing the rail (23), and (28) is a holder for fixing the support plate (24) to the main body of the sewing machine.

FIG. 2 is a sectional view taken along the line AA of FIG. In the figure,
(26) is a slider that is fixed to the moving table (6) and slides on the rail (23) to move the moving table (6), and (27) is a bracket (6a) provided on the moving table (6). An air cylinder whose tip is fixed to the end and a tube is fixed to the support plate (25) to slide the moving table (6) along the rail (23), and (31) is a metal piece described below on the upper surface. A proximity switch that closes its contact when it approaches, (32) a holder that fixes the proximity switch (31) to the bottom surface of the sliding plate (3),
(29) is an air cylinder whose tip passes through the hole (3c) on the sliding plate (3) and sticks to the upper surface of the sliding plate (3) during operation, and (30) is its holder.

FIG. 3 is a sectional view taken along line BB in FIG. In the figure,
(34) is a cloth held by the lid (5g), (33) is a metal piece for operating the proximity switch (31), and the lid (5g)
Attached to the proximity switch (3g when the lid (5g) is closed.
It is located on the upper surface of 1).

FIG. 4 is a perspective view showing the carrying section of the cloth holder. In the figure, (3a) to (3g) are holes formed in the sliding plate (3), (3c) is a hole through which the tip of the cylinder (29) sticks out,
(3a), (3b), (3d) are holes provided on the lower surface with a cylinder (not shown) having the same function. (3g) is a hole into which the proximity switch (31) is inserted with a certain size lower than the surface, and (3f) is a hole provided with a similar proximity switch (not shown). Other reference numerals indicate the same or corresponding parts as described above.

The operation of the present invention configured as shown in FIGS. 1 to 4 will be described with reference to the timing chart of FIG. 5 showing the operation of the present invention.

First, as an initial state, the cloth holders (4) and (5) are in the first position.
At the position shown in the figure, the lid (4g) is closed, the lid (5g) is open, the cylinders (13) and (21) are ON, and the cloth retainers (4) and (5) are engaged respectively. The arms (7), (8) and (15), (16) are fixed to the movable table (6). In this state, when the worker sets the sewn cloth (34) in the second cloth holder (5) and closes the lid (5g), the lid (5g) is attached to the metal piece (33). ) Is a proximity switch (3
1) The contact of the proximity switch (31) is turned on because it comes to the top. This is the timing of [A-1] shown in FIG. Then, when a certain time elapses and the timing of [B-1] is reached, the air cylinder (27) is actuated, the movable table (6) moves along the rail (23), and the second cloth retainer is moved. When (5) reaches the position where the first cloth retainer (4) was, the cylinder (21) is turned off at this point, and the blocks (5c) and (5d) move to the engaging arms (15) and (16). ) Is released, and the second cloth holder (5) is released from the movable table (6). At the same time, the presser arm (2) of the drive is turned on, and the positioning pins (2a) and (2b) are inserted into the blocks (5a) and (5b).
The second cloth retainer (5) is connected to the presser arm (2). At this time, a cylinder (not shown) for opening the lid (4g) of the first cloth retainer (4) is driven, and its shaft end is (4g).
The lid (4g) is opened with the hinges (4e) and (4f) as fulcrums, and the cloth (34) that has been sewn can be taken out. This state is the timing [C-1] in FIG.

At this time, when the presser arm (2) for moving the cloth holder is driven, the second cloth holder (5) is pressed against the slide plate (3) and is slid back and forth and left and right according to the programmed data. At the same time, the needle of the sewing machine head (1a) is driven to sew the cloth (34) held by the second cloth holder (5). During this time, the worker sets the cloth (34) for the next sewn product on the first cloth holder (4) and closes the lid (4g). At this time, the proximity switch (not shown) set in the sliding plate hole (3f) works in the same manner as described above and is turned on. This is the timing of [D-1] shown in FIG. Then, when the sewing of the cloth (34) set on the second cloth retainer (5) is completed, the sewing machine presser arm (2) is turned off.
And rises to open the second cloth holder (5). At the same time, the cylinder (21) is turned on and the second cloth holder (5) is fixed to the moving table (6). This is [E in Figure 5
-1] timing. At this time, the cylinder (27) is OF
F, the movable table (6) moves along the rail (23) to the state shown in FIG. 1, and the first cloth holder (4) reaches the position where the second cloth holder (5) was located. Then the cylinder (13) is OF
It becomes F, and the first cloth retainer (4) is opened. At the same time, the presser arm (2) is turned on and is connected to the first cloth holder (4).

At the same time, in the second cloth retainer (5), the air cylinder (29) works and the lid (5g) is opened as shown in FIG. 3, and the cloth (34) which has been sewn can be taken out. This is the timing of [F-1] shown in FIG. Then, the needle of the sewing machine head (1a) is driven to sew the cloth (34) held by the first cloth holder (4). Meanwhile, the second cloth retainer (5) is sewn to the next cloth (34).
And close the lid (5g). At this time, the proximity switch (31) set in the sliding plate hole (3g) works in the same manner as described above, and is turned on. This is the timing [A-2] shown in FIG. The same cycle is repeated thereafter.

In the above embodiment, two cloth holders are prepared for one sewing machine, and the cloth holders are configured to be moved and set alternately. However, the cloth holders may be three or more. Further, although the cloth retainer is shown moving to the left and right, the same effect can be obtained by moving the cloth retainer in the front-rear direction or in the arc direction.

[Effects of the Invention] As described above, according to the present invention, the means for holding the sewn product is constituted by an independent single cloth retainer, and a plurality of such fabric retainers are arranged so as to be alternately supplied to the sewing machine drive portion. Since the cloth holder is automatically opened with respect to the cloth holder that holds the completed cloth, it is easy to attach and detach the sewn product. Further, while the sewing machine is sewing a sewing product in one cloth retainer, the next sewing product can be set in another cloth retainer, which shortens the time for attaching and detaching the sewing product and reduces the production time. The property is improved. Further, since the cloth holder is also moved on a flat surface, there is an effect that the structure of the conveying device is simple and the cost can be reduced.

[Brief description of drawings]

1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 5 is a timing chart showing the timing of the present invention. 1: Sewing machine body, 1a: Sewing machine head, 2: Presser arm, 3: Sliding plate, 4: First cloth holder, 5: Second cloth holder, 6: Moving stand,
7,8: Engaging arm, 9,10: Block, 11: Axis, 12: Knuckle, 13:
Air cylinder, 14: Support base, 15,16: Engaging arm, 17,18: Block, 19: Shaft, 20: Knuckle, 21: Air cylinder, 22: Support base, 23: Rail, 24, 25, 28: Support plate. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Claims] 1. A moving base which moves along a slide plate provided on a sewing surface of a sewing machine main body by a transporting drive means, and a plurality of members which are provided on the moving base and are respectively driven by engaging drive means. A plurality of cloths that are detachably engaged with the plurality of engaging arms, are conveyed on the sliding plate by the moving table, are sequentially positioned at the sewing position of the sewing machine drive device, and are switched and connected to the presser arms. A retainer; and a drive means for opening, which is provided on the bottom surface of the sliding plate and projects the working end through the hole of the sliding plate to the upper surface to release the holding of the cloth retainer retracted from the sewing position. And automatic sewing machine. 2. The automatic sewing machine according to claim 1, further comprising a rail for moving the movable table along a slide plate. 3. The automatic sewing machine according to claim 1 or 2, further comprising a movable table which reciprocates the movable table by the transport drive means. 4. The automatic sewing machine according to any one of claims 1 to 3, wherein two cloth retainers are provided on the slide plate. 5. The automatic sewing machine according to claim 1, wherein an air cylinder is provided as the carrying drive means, the engagement drive means, and the opening drive means. sewing machine.