JP2793858B2 - Unwinding sensor device for drum type weft measuring and storing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unwinding sensor device of a drum type weft length measuring and storing device for measuring the length of a weft unwound from a drum and inserted into a weft.

2. Description of the Related Art In a shuttleless loom including a jet loom, a drum type weft length measuring and storing device (hereinafter, simply referred to as a length measuring device) is widely used to control the length of a weft inserted into a specified value. .

The length measuring device includes a stationary drum type and a rotating drum type, and the former is more general. Since the winding and storage of the weft around the drum is performed by the rotating yarn guide, high-speed performance is easy to achieve, and a fixed locking pin is arranged outside the drum to easily control the unwinding and locking of the weft. Because it can be.

Control of the locking pin is generally performed by an unwind sensor. That is, at a predetermined unwinding time, the locking pin is driven to the unwinding position to start weft insertion, the unwinding sensor detects that a predetermined number of turns of the weft yarn has been unwound from the drum, and It may be driven to the locking position. At this time, in consideration of the response time of the locking pin, the locking pin is set so that the timing at which the locking pin actually reaches the locking position is optimal with respect to the position of the weft being unwound in the final turn. The relative position of the unwinding sensor with respect to. If the response time of the locking pin is not negligible with respect to the unwinding time of one turn of the weft unwound from the drum, for example, the number of turns of the weft less by one turn than the predetermined number of turns is unwound. At this time, a locking signal for the locking pin may be transmitted, and special attention is often paid to maintain coordination between the response time of the locking pin and the unwinding time for one turn.

There are a reflection type and a transmission type as an unwinding sensor used for such an application. Generally, the latter has a wider adaptability to the type and color of the weft. In the latter, by setting the optical axis so as to cross the front surface of the drum, two pulse-like unwinding signals can be obtained corresponding to the unwinding of the weft for one turn. There is an advantage that the length of the weft can be measured with a resolution of 1/2 turn using a pair of unwinding sensors.

According to the related art, the release sensor is generally provided with a locking device in consideration of the release direction of the weft in order to measure the length of the weft unwound from the drum as accurately as possible. It must be arranged in a predetermined position with respect to the pin, for example immediately downstream of the locking pin. On the other hand, the direction in which the weft is released depends on the direction in which the weft is twisted.However, since the conventional unwinding sensor is of a fixed type, if it is necessary to cope with different twisting directions, the twisting direction is provided on both left and right sides of the locking pin. Each one for exclusive use
The only option is to provide a set or to use one set of unwinding sensors for wefts in different twist directions. In other words, according to the former, two sets of unwinding sensors are required, which complicates the entire structure and is uneconomical. According to the latter, even if it is good in one twisting direction, the other is twisted. A large measurement error may occur in the direction.

Therefore, an object of the present invention is to make the whole structure simple and economical by allowing one set of release sensors to be switchably mounted on any of the left and right sides of the locking pin, if necessary, in view of the situation of the prior art. It is an object of the present invention to provide a release sensor device of a drum type weft length measuring and storing device which is not likely to cause an excessive measurement error.

Means for Solving the Problems A first invention according to this application for achieving the above object has a sensor bracket mounted on a front surface of a drum, and a sensor bracket mounted on the sensor bracket to detect a weft unwound from the drum. The gist is that the sensor bracket is switchable so that the optical axis of the light emitter and the light receiver passes downstream immediately adjacent to the locking pin regardless of the unwinding direction of the weft. I do.

In addition, the sensor bracket may be formed in a ring shape, and may also serve as a mounting seat for a balloon breaker, or may incorporate a head amplifier for a light receiver, and further house a connection wire connected to a light emitter and a light receiver. May be provided.

The sensor bracket can be mounted by reversing the front and rear surfaces, or by rotating the drum in the circumferential direction, and in the latter case, it can be provided with a permanent magnet for positioning.

The gist of the second invention is that it comprises a sensor bracket that can be switched and mounted on both side surfaces of a locking pin block, and a reflective sensor that is attached to the sensor bracket and detects a weft unwound from a drum. .

According to the configuration of the first aspect, the light emitter and the light receiver on the sensor bracket form a transmission type unwinding sensor whose optical axis crosses the front surface of the drum, and are one turn away from the light receiver. Two unwinding signals can be obtained for each unwinding of the weft. Further, by switching the mounting mode of the sensor bracket, the optical axes of the light emitter and the light receiver can pass through the downstream side immediately adjacent to the locking pin, regardless of the unwinding direction of the weft. Can be easily coped with the change of the twist direction.

The ring-shaped sensor bracket, which also serves as the mounting seat of the balloon breaker, is convenient when the balloon breaker is provided in front of the drum, and if a head amplifier is incorporated, a weak signal output from the light receiver is transmitted over a long distance. There is no need, and stable operation can be realized. further,
If the connecting wire is accommodated by providing the annular groove, the processing of the connecting wire is simplified, and the appearance is also elegant.

The mode of switching mounting of the sensor bracket may be such that the optical axes of the light emitter and the light receiver can be passed through the left and right arbitrary sides of the locking pin as required. That is, the sensor bracket may be one in which the front surface and the rear surface are reversed, or may be one that rotates and moves in the circumferential direction of the drum. Note that when rotating, the switching operation can be completed by one behavior by using a permanent magnet for positioning.

According to the configuration of the second invention, since the reflection type sensor is an unwinding sensor that outputs one unwinding signal every time one turn of the weft is unwound, by changing the mounting position of the sensor bracket. Like the first invention, it is possible to cope with a change in the twist direction of the weft.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

Unwinding sensor device of drum type weft measuring and storing device (hereinafter, referred to as
10) is a sensor bracket 11,
The sender 12 and the receiver 13 are the main members (first
), The length measuring device D is used by being mounted on the front surface of a divided type drum D1, D1.

The length measuring device D includes drums D1, D1..., And a rotating yarn guide D2 for winding and storing the weft Y around the peripheral surface of the drums D1, D1.
A motor D3 for driving the rotating yarn guide 2D, and a locking pin D4 which moves back and forth with respect to the peripheral surface of the drum D1 and controls the release of the weft Y on the drums D1, D1. Figure 1,
FIG. 2).

The weft Y is supplied from the rear of the motor D3, is drawn through a yarn passage (not shown) formed in the axis of the motor D3 to the tip of the hollow rotary yarn guide D2, and drives the rotary yarn guide D2 to rotate. Is wound and stored on the peripheral surface of the drums D1, D1. The tip of the locking pin D4 is a drum
Drums D1, D1 ... at the locking position where they enter the hole D1a of D1.
The upper weft Y is locked to prevent unwinding, while the hole D1a
At the unwinding position where the weft yarn Y is unwound from the drum D1, D1..., And can be inserted through a weft insertion nozzle (not shown).

Now, the rotating direction of the rotating yarn guide D2 is indicated by the arrow in FIG.
Assuming the K1 direction, the weft Y from the drums D1, D1.
It is unwound while forming a balloon in the direction of arrow K2 in the same direction as K1. Therefore, the direction of the arrow K2 at this time is defined as the unwinding direction of the weft Y.

The locking pin D4 is electrically driven by an electromagnetic solenoid housed in the locking pin block D4a. The locking pin block D4a is attached to the fixed frame via the bracket D4b.
Fixed to D5.

The sensor bracket 11 has an inner diameter slightly larger than the drums D1, D1,..., And includes a fixing portion 11a, mounting bolts 11a1, 11a1,.
Are detachably mounted on the front surfaces of the drums D1, D1,.

The emitter 12 and receiver 13 are the mounting holes for the sensor bracket 11.
11b and 11c (FIGS. 1 and 3). However, the mounting holes 11b and 11c are formed so as to face each other in the radial direction of the sensor bracket 11, and
2. The light receiver 13 forms a transmission type unwinding sensor, and the drum D
It has an optical axis that crosses the front face of 1, D1,. Note that the one attachment light 11b is bored at a position immediately adjacent to the fixing portion 11a.

An annular groove 11d is formed on the outer periphery of the sensor bracket 11 (FIGS. 1 and 2). Connection wires (not shown) for the light emitter 12 and the light receiver 13 are housed in the annular groove 11d and connected to the electronic circuit 14 housed in the fixed part 11a. The electronic circuit 14 incorporates a head amplifier of the light receiver 13 and the like,
The electronic circuit 14 is connected to a control device (not shown) via an external cable 14a. It is preferable that the annular groove 11d be filled with a suitable filling material after the connection electric wire is housed.

On the front surface of the sensor bracket 11, a truncated cone-shaped balloon breaker 15 is detachably mounted via bolts 15a, 15a. The maximum inner diameter of the balloon breaker 15 is preferably substantially the same as or slightly larger than that of the sensor bracket 11.

The sensor bracket 11 is formed symmetrically in the front-rear direction, including the fixing portion 11a. That is, the fixing part 11a can be screwed to the front of the locking pin block D4a even if the front and rear of the sensor bracket 11 are reversed, and the balloon breaker 15 can be attached to the rear of the sensor bracket 11 It is assumed that

In the sensor device 10 having such a configuration, the projector 12 has the locking pin D4
(Figs. 1 and 3), the unwinding from the drums D1, D1 ... in units of 1/2 turn of the drums D1, D1 ... The length of the weft to be drawn can be measured. The weft Y unwound from the drums D1, D1... Forms a balloon rotating in the unwinding direction on the front surface of the drums D1, D1.
This is because it crosses the optical axis of the transmission type unwinding sensor consisting of every 1/2 turn. That is, the optical axes of the light projector 12 and the light receiver 13 at this time pass through the downstream side immediately adjacent to the locking pin D4 (the dashed line in FIG. 3).

When the twisting direction of the weft Y is reversed, the rotating direction of the rotating yarn guide D2 is also reversed, so that the unwinding direction of the weft Y at this time is opposite to the direction of the arrow K2 in FIGS. Become. At this time, the sensor bracket 11, the fixing portion 11a
Reverses the front and rear with the two connected together,
By re-attaching to the locking pin block D4a, the projector 12 can be moved to a symmetric position with the locking pin D4 interposed. Therefore, the projector 12 also has the locking pin
It is located immediately downstream of D4 and, together with the photodetector 13, can realize the same measurement operation as a whole. That is, the optical axes of the light projector 12 and the light receiver 13 at this time pass through the downstream side immediately adjacent to the locking pin D4, despite the change in the unwinding direction of the weft yarn Y (see FIG. 3). Chain line). At this time, the balloon breaker 15 is also reattached from the front side to the rear side of the sensor bracket 11.

In the above description, the mounting positions of the light projector 12 and the light receiver 13 may be reversed, and may be inserted into the mounting holes 11c and 11b, respectively. In addition, the balloon breaker 15
It may be attached to a dedicated mounting seat separate from 11. In addition, the balloon breaker 15 may be attached as needed.
This may be omitted.

The electronic circuit 14 may be installed outside without being housed in the fixing portion 11a of the sensor bracket 11, and its head amplifier may be assembled integrally with the light receiver 13. Also, the drums D1, D1,... May be of an integral type instead of a split type.

Further, the sensor bracket 11 can be attached to any fixed member other than the locking pin block D4a via a suitable bracket or without a bracket.

Other Embodiments The light emitter 12 and the light receiver 13 on the sensor bracket 11 are not necessarily provided on the sensor bracket 11 as long as they cross the front surface of the drum D1.
(FIG. 4). As in the previous embodiment, the front and rear of the sensor bracket 11 are reversed so that the light emitter 12 and the light receiver 13 are positioned on any side of the left and right with respect to the locking pin D4. The shaft can pass immediately downstream of the locking pin D4 irrespective of the unwinding direction of the weft Y (single-dot chain line and two-dot chain line in the same drawing). The sensor bracket 11 has a long hole 11a2. Large fixed part
11a may be attached, and the drum D1 may be rotated and mounted in the circumferential direction (FIG. 5). By appropriately determining the length of the long hole 11a2 and the rotation angle θ determined thereby, the positions of the light emitter 12 and the light receiver 13 are switched to predetermined positions,
The positions of the optical axes of the light emitter 12 and the light receiver 13 can be appropriately set (the dashed line and the two-dot chain line in FIG. 3).

The sensor bracket 11 may include a fixed ring 11e, a rotating ring 11f, and a pair of semicircular rings 11g, 11g (FIGS. 6 and 7). The light emitter 12 and the light receiver 13 are incorporated in a rotating ring 11f.
The annular groove 11f1 has an annular protrusion 11e1 of the fixing ring 11e.
Are slidably fitted to each other so as to be rotatable relative to the fixed ring 11e. Semicircular ring 11g, 11g
Is fixed to the rotating ring 11f, and integrally connects the fixed ring 11e and the rotating ring 11f. Permanent magnets 11e2, 11e2, 11f2, and 11f2 for positioning the attracting polarities are embedded in the fixed ring 11e and the rotating ring 11f at appropriate positions.
The light projector 12 and the light receiver 13 can be positioned and switched to a predetermined position according to one behavior via 2.

The sensor bracket 11 does not necessarily have to be ring-shaped (FIG. 9). This is composed of an arc-shaped member 11k into which the light emitter 12 is incorporated, and a fixing member 11j to which the light receiver 13 is attached.
12 on any side of the locking pin D4.
2. The optical axis of the light receiver 13 can be moved to an appropriate position. However, it is assumed that the light receiver 13 can receive the light from the light emitter 12 even when the light emitter 12 is on either side of the locking pin D4, and the light emitter 12 and the light receiver 13 at this time are , Substantially facing each other. Note that the arc-shaped member 11k may be a member that rotates and moves in the circumferential direction of the drum D1.

The sensor device 10 can also be formed of a sensor bracket 16 that can be switched and mounted on both side surfaces of the locking pin block D4a, and a light emitter 12 and a light receiver 13 that are attached to the lower surface of the sensor bracket 16 (FIG. 8). The emitter 12 and the receiver 13 are
Since the reflection type sensor for detecting the weft Y unwound from the drum D1 is formed, the sensor bracket 16 is moved from one side of the locking pin block D4a to the other side (solid line in FIG. The two-dot chain line) can provide the same operation as the above-described embodiments.

In each of these embodiments, the light emitter 12, the light receiver
13, the respective mounting positions may be reversed.

Effect of the Invention As described above, according to the first invention of the present application, a light emitter and a light receiver are attached to a sensor bracket, and the light axis of the light emitter and the light receiver is set to the locking pin regardless of the weft unwinding direction. By allowing the sensor bracket to be switched and mounted so as to pass through the nearest downstream side, the transmission type unwinding sensor formed by the light emitter and the light receiver can be used regardless of the weft unwinding direction. Side, the weft can be detected, so that even when the twist direction of the weft is changed, there is no need to provide a dedicated unwinding sensor in each unwinding direction, thus simplifying the overall structure. And an excellent effect that there is no possibility that an excessive measurement error occurs.

Further, according to the second invention, the same effect as that of the first invention can be obtained.

[Brief description of the drawings]

1 to 3 show an embodiment, FIG. 1 is an overall exploded perspective view, FIG. 2 is a longitudinal sectional view of a main part, and FIG. 3 is a cross section taken along line XX of FIG. FIG. FIG. 4 and FIG. 5 are equivalent views of FIG. 6 and 7 show still another embodiment. FIG. 6 is an exploded perspective view, and FIG. 7 is an enlarged cross-sectional view taken along the line ZZ of FIG. FIG. 8 is an enlarged explanatory view of a main part corresponding to FIG. 3, showing still another embodiment. FIG. 9 is a diagram corresponding to FIG. 3 showing still another embodiment. Y ... weft D1 ... drum D4 ... locking pin D4a ... locking pin block 11, 16 ... sensor bracket 11d ... annular grooves 11e2, 11f2 ... permanent magnets 12 ... projector 13 ... receiver 15 ...... balloon breaker

Claims (8)

(57) [Claims] 1. A sensor bracket mounted on a front surface of a drum, a light emitter mounted on the sensor bracket and detecting a weft unwound from the drum, and a light receiver, wherein the sensor bracket is provided with the light emitter and the light receiver. An unwinding sensor device for a drum type weft length measuring and storing device, characterized in that the optical axis can be switched and mounted so as to pass through the downstream side immediately adjacent to the locking pin regardless of the unwinding direction of the weft. 2. The unwinding sensor device for a drum type weft length measuring and storing device according to claim 1, wherein said sensor bracket is formed in a ring shape and also serves as a mounting seat for a balloon breaker. 3. The unwinding sensor device for a drum type weft length measuring and storing device according to claim 1, wherein a head amplifier for the light receiver is incorporated in the sensor bracket. 4. The sensor bracket according to claim 1, wherein the sensor bracket has an annular groove for accommodating a connection wire connected to the light emitter and the light receiver. Unwind sensor for drum type weft measuring and storing device. 5. A drum type weft length measuring and storing device according to claim 1, wherein said sensor bracket is mountable with its front and rear surfaces reversed. Unwinding sensor device. 6. The drum type weft length measuring and storing device according to claim 1, wherein the sensor bracket is rotatable in the circumferential direction of the drum and can be mounted. Unwind sensor device of the device. 7. The unwinding sensor device for a drum type weft length measuring and storing device according to claim 6, wherein said sensor bracket includes a permanent magnet for positioning. 8. A drum type weft length measuring and storing device comprising: a sensor bracket which can be selectively mounted on both side surfaces of a locking pin block; and a reflection type sensor which is attached to the sensor bracket and detects a weft unwound from a drum. Unwinding sensor device.