JPH0555624B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a jumping device for an embroidery sewing machine.

[Conventional technology and its issues]

In an embroidery sewing machine, the fabric is moved vertically or horizontally within a predetermined maximum permissible pitch during one lifting/lowering process of the needle bar, and the movement of the frame on which the fabric to be embroidered is stretched is combined with the lifting/lowering movement of the needle bar. It is designed to be embroidered by combining them.

However, depending on the embroidery pattern, it may be necessary to move the frame side by one or more pitches during the needle raising and lowering process. For this reason, even if the frame side is to be moved one or more pitches, it is necessary to perform so-called jumping to prevent the needle bar from moving up and down until it moves to a predetermined position.

Various types of jumping devices have been proposed and put into practical use, but there is no one that can operate at high speed and accurately set the jumping distance to any desired length. There was a limit. Furthermore, if the mechanism is complex and the speed is high, the noise will be significant.

It is an object of the present invention to provide a simple device that can arbitrarily set the jumping distance up to the maximum allowable frame movement.

[Means to solve the problem]

An elevating frame that is moved up and down by the drive of the sewing machine is supported on a shaft arranged parallel to the needle bar, and a pusher is swingably supported on the elevating frame so as to selectively come into contact with the upper part of the needle bar. In addition, a shaft that is selectively fitted into two parallel guide holes of a guide plate protruding from the sewing machine frame is provided on this push-down tool, and the push-down tool is changed by switching the shaft of this push-down tool with a selection lever. Perform jumping by selecting the upper part of the needle bar and a position away from the needle bar.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 denotes a head frame of a sewing machine having a desired shape. In a multi-head sewing machine, a large number of head frames 1 are arranged at predetermined intervals, and only the front head of one head is shown in the figure.
Reference numeral 2 denotes a drive shaft that is disposed so as to pass through a plurality of adjacent head frames 1 in the horizontal direction, and this drive shaft 2 has a cam 3 for raising and lowering the thread take-up and a cam for raising and lowering the needle bar for each head frame. The cams 3 and 4 are eccentrically wedged or fixed as a set, and as the drive shaft 2 rotates, these cams 3 and 4 also rotate together in synchronization.

The cam 3 has a cam groove with a shape suitable for raising and lowering the thread take-up, and the cam 4 has a cam groove with a shape suitable for raising and lowering the needle bar, and the rotation of the cam 3 causes the link 5 to swing. The link 5 is provided as follows. The swing link 5 is swingably supported by the head frame 1 through a support shaft 6 at its midpoint at the sewing position of the sewing machine.

A locking pin 7 is provided at the tip of the swing link 5 and protrudes through the link in the lateral direction, and both ends of the locking pin 7 are tapered. The rear end is surely locked with the fork-like locking portion 8a. The thread take-up 8 is swingably supported on the head frame by a spindle 9, and when one head of the sewing machine has a plurality of needles, the number of the thread take-up 8 corresponds to the number of needles.
In addition, the balance 8 and the needle are arranged vertically opposite each other. Note that a large number of balances 8 are arranged adjacently at predetermined intervals,
One of the plurality of thread take-up levers, which is selectively located at a fixed position at the sewing position, engages with a locking pin of a swing link and swings.

Reference numeral 12 denotes a shaft, which is arranged in the vertical direction, and whose upper and lower ends are supported by the head frame 1 via bearings.A needle shaft mounting plate (not shown) is attached to the lower part of this shaft 12 via a fixture 16. A plurality of needle bars 13 are provided on this needle shaft mounting plate at fixed pitches around the shaft 12, and springs 14 and 15 are attached to each needle bar 13 so that the needles can be slid in the vertical direction and restored. A needle N is fixed to the lower end of the rod. An attachment 17 is fixed to the upper end of the needle bar 13 for raising and lowering the needle bar.

The needle bar pusher 20 is disposed below the thread take-up lever at the sewing position (fixed position) and moves in the vertical direction.
This causes the needle bar 13 at the sewing position to push down the upper end of the attachment 17. This push-down tool 20 is provided protrudingly on an elevating frame 18 that is fitted and supported on the shaft 12 so as to be slidable in the vertical direction.
This lifting frame 18 further includes a push-up tool 19 for pushing the needle bar up to a predetermined highest position.
are provided in a protruding manner, and the attachment 17 is sandwiched between the upper and lower parts of the push-down tool 20 and the push-up tool 19, which are vertically opposed to each other, and the needle bar 13 is raised and lowered by raising and lowering the raising and lowering frame. This push-up tool 19 is fixed to the lifting frame 18, and the push-down tool 19 is connected to the support shaft 20s passing through the lower part of the lifting frame 18.
It is swingably supported by a part of the

Further, a rotation stopping mechanism is provided to prevent the elevating frame 18 from turning when it moves up and down along the axis, that is, when it is guided. This is a rotation stopping mechanism in which a push-up tool and a push-down tool protruding from the lifting frame 18 are arranged oppositely so as to sandwich the attachment at the upper end of the needle bar from above and below to maintain a relative relationship. However, in the illustrated embodiment, a guide groove 21a of a guide rail 21 disposed parallel to the shaft 12 along the head frame 1 is provided protruding from the elevating frame 18 to make the guide piece 21b slidable. This is done by inserting it in place.

Further, a guide plate 22 is provided protruding from this guide rail 21, and this guide plate 22 has two guide holes 22 parallel to the needle bar and connected at the upper part.
a, 22b are formed in an inverted U-shape, and this guide hole 22a is close to the needle bar, and the other guide hole 22a is close to the needle bar.
2b should be far away. Then, one of the guide holes 22a and 22b
A pin 23, which is selectively fitted into pins 2a and 22b, is provided to protrude from the push-down tool 20.

Further, a selection lever 24 is provided on the upper part of the guide plate 22 so as to be able to swing freely on a shaft 23.
The lower end is formed into a fork shape, and this fork-shaped locking piece 24a is locked to the shaft 23. Further, the position of the locking piece 24a of this selection lever 24 is
When the selection lever 24 swings, the shaft 23 inserted into the locking piece 24a is moved from the guide hole 22a to the guide hole 22b or in the opposite direction. urge

The lifting and lowering movement of the lifting frame 18 is carried out by pivoting the tip of a lever 26, which is swingably supported by the head frame 1 on a shaft 25, to the lifting frame 18.
6 is swung by the rotation of the cam 4, and therefore the lever 2
6 and its swing angle determine the lifting distance of the lifting frame.

In the jumping device configured as described above, the sewing machine is driven, and even though the lifting frame 18 is moving up and down, when a jumping signal is applied, the selection lever 24 is activated by the solenoid 27 via the lever 28 and the shaft 29. It oscillates depending on the ON/OFF operation of the solenoid. The shaft 23 that is locked at the tip of this selection lever is in the guide hole 22a.
When the needle bar is in this position, the needle bar is pushed down by the push-down tool 20 through the attachment as the elevating frame moves up and down, and then pushed up by the push-up tool 19 to repeat the up and down movement, but the shaft 23 is moved toward the guide hole 22b side by the selection lever. When moved, the push-down tool moves to the shaft 20 due to the relative positional relationship between the shafts 20s and 23.
The upper part of the push-down tool swings toward the opposite side of the needle bar, centering on s, and the push-down tool is in a position separated from the attachment. In this state, even if the elevating frame goes up and down, the push-down tool cannot press down the attachment. The hands do not move and perform the desired jumping operation.

In addition, the one shown in FIG.
The push-down tool 20, which is supported by the lifting frame with spring pressure, is operated by the guide holes 22a, 22b of the guide plate 22 and the selection lever 31 or 32 in the same manner as in the embodiment shown in FIG. .

〔Effect of the invention〕

According to the present invention, since the push-down tool for pushing down the needle bar is provided on the lifting frame so as to be able to swing away from the top surface of the needle bar, the jumping operation can be performed reliably with a simple mechanism, and the mechanism is also simple. Moreover, since the elevating frame only moves up and down, there is an advantage that no unnecessary noise is generated even during the jumping operation.

[Brief explanation of drawings]

The drawings show an embodiment of the jumping device in the embroidery sewing machine of the present invention, and FIG. 1 is a side view of the main parts;
FIG. 2 is a plan view, FIG. 3 is a side view of a different embodiment, and FIG. 4 is an explanatory diagram of a different selection lever. 12 is a shaft, 13 is a needle bar, 17 is an attachment, 18 is an elevating frame, 20 is a pusher, 22 is a guide plate, 22a, 22b are guide holes, 23 is a shaft, 24 is a selection lever, and 27 is a solenoid.

Claims (1)

[Claims] 1. An elevating frame that is moved up and down by the drive of the sewing machine is supported on a shaft arranged parallel to the needle bar, and a pusher is swingably supported on this elevating frame so that it selectively comes into contact with the upper part of the needle bar. , and this push-down tool has a protruding shaft that selectively fits into two parallel guide holes of a guide plate protruding from the sewing machine frame, and the push-down tool can be pressed by switching the shaft with a selection lever. 1. A jumping device for an embroidery sewing machine, characterized in that jumping is performed by selecting the upper part of the needle bar and a position spaced apart from the needle bar.