JPS59186589A - Drive apparatus of sewing machine - 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] The present invention relates to a driving device for a sewing machine.

In industrial and other sewing machines, one motor is used to drive the needle and the hook, and power is transmitted to the needle and hook via a timing belt and a line shaft. Therefore, a long line shaft is required, and the screws in various parts of the line shaft, timing belt, etc. are likely to loosen, causing failure. Furthermore, if a long line shaft is used, the inertia force will increase accordingly, making it difficult to start and stop smoothly, and it will also be difficult to create a robot by equipping the tip of a telescoping arm with a needle and hook. there were.

The present invention aims to solve such conventional problems, and its characteristics are that a needle drive motor and a hook drive motor are separately provided, and the needle drive motor A pulse transmitter that generates a pulse signal synchronized with the rotation of the hook is provided, and the hook driving motor is driven in synchronization with the needle driving motor by the pulse signal from the pulse transmitter.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
The figure illustrates a sewing machine for sewing futons, in which (1) is a sewing machine table and (2) is a sewing machine body. A needle bar (3) is provided at the tip of the sewing machine body (2) so as to be movable up and down, and a needle (4) is attached to the lower end of the needle bar (3). Needle bar (3
) is interlocked with a shaft (6) horizontally supported within the sewing machine body (2) via a crank mechanism (5) at its upper end. (7) is a needle drive motor mounted on the sewing machine body (2), and is composed of, for example, a pulse motor, and its output shaft (8) is interlocked with the shaft (6) via a bevel gear mechanism (9). θO is a handwheel, which allows the shaft (6) to be rotated via appropriate interlocking means. θD is a pulse encoder representing a row of pulse transmitters, which generates a pulse signal synchronized with the rotation of the needle drive motor (7). In addition, two disks (2) αa are fixedly attached to the shaft (6), and the disk 0203 that is twisted
A needle up position sensor α turret, a needle down position sensor α9, a needle down position discrimination sensor OQ, etc. are provided on the fixed side corresponding to the peripheral edge of the needle. 07) corresponds to the needle (4) on the sewing machine table (
1) is a pot provided on the lower side, and is supported by a holder (not shown). The stop is a hook driving motor, which is mounted on the lower side of the sewing machine table (1) via a bracket 191, and its output shaft is interlocked with the hook via a bevel gear machine 19+211. A disk is provided on the output shaft, and a rough ground position sensor is attached to the fixed side corresponding to the peripheral edge of the disk. The motor for driving the pot consists of a pulse motor. Sensor θ4α9α6 (231
Consists of half-odd sensor, reed switch, etc.

In Figure 2, in the Hapalus control circuit,
A motor (7) a& is connected via a driver isolation interface and a driver (8) (c). (to) encoder isolation
Interface, ■ is input isolation.

(31) is a high speed maximum setting device, (3 is a low speed maximum setting device,
(33) is a slow start setting device, and (34) is a stop positioning setting device.

Next, the effect will be explained. When a start command is given when sewing a futon ('3θ, etc.), a signal is sent from the pulse control circuit (24+) to the needle drive motor (7) via the interface (c) and driver so, and the needle drive motor (7) is started. The needle (4) is driven up and down via the output shaft (6), bevel gear mechanism (9), shaft (6), crank mechanism (5), and needle bar (3).At the same time, the pulse encoder Ql) generates a pulse signal synchronized with the rotation of the needle drive motor (7) and inputs it to the pulse control circuit via interface 4. A signal is input to the hook drive motor, and this hook drive motor 181 starts to rotate in synchronization with the needle drive motor (7), and the bevel gear mechanism (21) on the output shaft.
The kettle Q7) is driven through the kettle Q7). And the needle drive motor (
When the rotational speed of 7) changes, the pulse signal generated by the pulse encoder αB changes accordingly, so the rotational speed of the hook driving motor also changes in synchronization.

When adjusting each part by operating the handwheel 00, the handwheel 00 is operated after turning off the power to the needle drive motor (7).

Then, the shaft (6), crank mechanism (5), needle bar (3)
), the needle (4) moves, and the needle drive motor (7
) also rotates freely via the bevel gear mechanism (9). At this time as well, a pulse signal synchronized with the movement of the needle drive motor (7) is generated from the pulse encoder Ql), so the hook drive motor (old) rotates synchronously and drives the hook Q force.

Note that when performing automatic operation, if there is a deviation from the origin of the hand (4) and hook αη, automatic operation cannot be performed, so the adjustment is made as follows. That is, first, the needle position is determined by the needle position determination sensor αQ, and the original position of the hook aη is adjusted. Then, when the rough ground position sensor works, the needle position discrimination sensor QQ, needle top position sensor α4, and needle position sensor a9
Adjust the needle (4) to its original position with the operation. When these original positions are aligned, each pilot lamp lights up, so after confirming that the pilot lamps are lit, automatic operation begins.

FIG. 8 and FIG. 4 show another embodiment, and FIG. 8 shows a pair of upper and lower bending links (3e el191) provided on the fixed frame (2) 1 via a support shaft (8η) so as to be freely bendable and extendable. A needle drive unit (40) and a hook drive unit (41) are provided at the tip of the link Q81 (391), and Fig. 4 shows a pair of upper and lower telescopic arms (4z (431)
is provided rotatably around the support post I44), and a needle drive unit decoy and hook drive unit (41) are provided at the tip of each telescoping arm (4'2 +431).In these cases, numerical control is required. Although it is possible to achieve complete robotization by introducing the robot, as mentioned above, by using a separate motor (7) αε,
Its implementation is easier.

Motor (7) [11+1 In addition to the Hapalus motor, a servo motor etc. can also be used.

According to the present invention, the needle drive motor and hook drive motor are separately provided, and the hook drive motor is synchronized with the needle drive motor using a pulse transmitter, so that the line shaft Since timing belts and the like are not required, the overall size can be reduced and the occurrence of failures can be reduced. It is very quick to start up, stop, etc., and
Since electrical connection is sufficient, robotization can be easily achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram thereof, and FIGS. 8 and 4 are block diagrams showing other embodiments. (1)...Sewing machine table, (2)...Sewing machine body,
(4) Needle, (7)... Motor for driving needle, αD... Pulse encoder, (lη... Hook, tap... Motor for driving hook, f24+... Pulse control circuit.

Claims (1)

[Claims] 1. Equipped with separate needle drive motor and hook drive motor,
A pulse transmitter that generates a pulse signal synchronized with the rotation of the needle drive motor is provided, and the hook drive motor is driven in synchronization with the needle drive motor by the pulse signal from the pulse transmitter. A sewing machine drive device characterized by: