JPH10119930A - Box front flap opening device - Google Patents

Abstract

(57) Abstract: A front flap opening device for a box includes a valley 6 for lowering an opening arm and engaging the lower arm with the front flap of the box.
a and a crest 6b for raising the open arm to open the front flap. A detour cam 16 having a holding portion 16a for holding the open arm raised when the open arm is retracted is provided between the peak and the valley of the open cam, and a connecting portion between the peak of the open cam and the detour cam. Route switching means 1
7 are provided. The path switching means guides the cam follower 14 of the open arm from the peak of the open cam to the bypass cam when the open arm is retracted. [Effect] When the open arm is retracted, it can be held in a raised state to prevent interference with the box.
Processing capacity can be improved as compared with a case where the box is unloaded to a position where it does not interfere with the open arm and then the open arm is retracted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front flap opening device for opening a front flap of a box.

[0002]

2. Description of the Related Art Conventionally, as a front flap opening device for opening a front flap of a box, a conveying means for conveying a box, an opening arm engaging with the front flap of the box, and a driving means for moving the opening arm forward and backward. An open cam that engages a cam follower provided on the open arm and raises and lowers the open arm in accordance with the advance and retreat of the open arm. The open cam lowers the open arm and engages with the front flap of the box. There is known a valley portion having a valley portion formed continuously with the valley portion and a ridge portion which raises the open arm and opens the front flap when the open arm is advanced (US Pat. No. 337).
No.6692). In such a front flap opening device,
The release arm is held at the retracted end by the driving means,
When a box is supplied by the transporting means in this state, the driving means is operated to advance the opening arm. As a result, the open arm is lowered by the valley of the open cam and engaged with the front flap, and subsequently the open arm is raised while being advanced along the ridge of the open cam.
This allows the front flap to open forward with respect to the box. The open arm, which has opened the front flap and has become the forward end, is retracted by the driving means and returned to the original position when the box is carried out and there is no risk of interference.

[0003]

However, in the front flap opening device, since the opening arm is reciprocated, the opening arm is retracted until there is no possibility that the box is carried out and interferes with the box. And the processing capacity could not be improved accordingly. The present invention has been made in view of such circumstances, and provides a front flap opening device capable of immediately retreating an opening arm which has become a forward end regardless of a position of a box.

[0004]

That is, the present invention provides a transporting means for transporting a box, an open arm which engages with a front flap of the box, a driving means for moving the open arm forward and backward, and a drive unit provided on the open arm. An open cam that engages with the cam follower and raises and lowers the open arm in accordance with the advance and retreat of the open arm.The open cam includes a valley that lowers the open arm and engages with the front flap of the box. A front flap opening device for a box having a crest formed continuously with a valley and having a crest for raising the opening arm and opening the front flap when the opening arm advances, wherein the crest and the valley of the opening cam are provided. And a bypass cam having a holding portion for holding the raised arm at the time of retreat when the open arm is retracted, and a connecting portion between the peak portion of the open cam and the detour cam, when the open arm is advanced. Allow movement of the serial cam follower from the valleys of the releasing cam to the crest portion, when retraction of the open arms is provided with a path switching means for guiding the cam follower from the crest of the opening cam to the bypass cam.

[0005]

According to the above-described structure, when the open arm is advanced, the open cam is moved from the valley to the mountain, so that the front flap of the box can be opened as in the prior art. The opening arm that has opened the front flap of the box is retracted by the driving means. At this time, the path switching means guides the opening cam from the top of the opening cam to the detour cam, and rises by the holding part of the detour cam. It will be retreated while being kept in the state where it was. As a result, it is possible to prevent interference between the retreating open arm and the box, so that the processing of the front flap opening device is reduced as compared with a case where the box is carried out to a position where it does not interfere with the open arm and then the open arm is retreated. Ability can be improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, a front flap opening device 1 for a box comprises a conveying means 3 for intermittently conveying a plurality of boxes 2 at a constant interval;
Two open cams 5 provided on the machine frame 4 and sequentially arranged along the conveying direction of the conveying means 3, and advanced and retracted along each open cam 5, and a cam surface 6 of each open cam 5. Open arms 7 to be lifted and lowered, and rodless cylinders 8 as drive means for simultaneously moving each open arm 7 forward and backward
And The transport means 3 is adapted to intermittently transport each box 2 at the same interval between the two open arms 7, and the rodless cylinders 8 are operated in synchronization with the transport means 3. I have. The rodless cylinder 8 includes a slider 10 reciprocated by the rodless cylinder 8 as shown in FIGS.
The bases of a pair of swing arms 12, 12 are pivotally supported on the upper and lower sides of a plate 11 fixed to the slider 10, respectively. A connecting member 13 is swingably connected to the tip of each of the swinging arms 12, 12. The connecting member 13 is provided with a cam follower 14 that engages with the cam surface 6 of the opening cam 5. The open arm 7 is integrally attached to the arm. Therefore, if the slider 10 is reciprocated by the rodless cylinder 8, the cam follower 14 and the connecting member 13
The opening arm 7 can be moved up and down via the.

As shown in FIG. 4, the opening cam 5 is formed by forming a cam groove (see FIG. 3) on the surface of an elongated plate member 15, and the upper surface of the cam groove is formed by the cam. Surface 6. The cam surface 6 has a valley portion 6a curved downward and a ridge portion 6b formed continuously with the valley portion 6a on the front side in the transport direction of the box 2 and curved upward. It has. Therefore, according to the cam surface 6 of the opening cam 5, when the opening arm 7 is advanced by the rodless cylinder 8, the cam follower 14 moves from the rear (right) upper end of the valley 6a to the bottom thereof. The lower end of the opening arm 7 is moved to the
(See FIG. 1), and the cam follower 14 is
The lower end of the opening arm 7 is engaged with the inside of the front flap 2a (FIG. 1) of the box 2 when the bottom of the box a is moved to the bottom of the crest 6b. Further, the opening arm 7 engaged with the inside of the front flap 2a lifts the front flap 2a while rotating the front flap 2a forward in the transport direction when the cam follower 14 climbs the rear slope of the mountain portion 6b. When the front flap 2a is pushed down to the front side at a stage where the front flap 2a goes down the front side slope beyond the top of the portion 6b, the front flap 2a is opened.

Next, the plate member 15 is provided with a bypass cam 16 for connecting the top of the peak 6b of the open cam 5 and the rear end of the valley 6a. The bypass cam 16 is also formed by forming a cam groove on the surface of the plate-like member 15. The detour cam 16 is provided at the peak 6 of the cam surface 6.
b, a holding portion 16a extending horizontally to the rear side at the same height as the top of the b and up to the bottom of the valley 6a to hold the raised arm 7 in a raised state when the opening arm 7 is retracted, and an opening cam from the holding portion 16a. And a slope portion 16b formed obliquely downward toward the upper rear side of the valley portion 6a. When the opening arm 7 moves forward, the cam follower 14 moves from the valley 6 a of the opening cam 5 to the connection between the top of the crest 6 b of the opening cam 5 and the holding portion 16 a of the bypass cam 16.
b to the forward end of the open cam 5, while the cam follower 14 is
A path switching means 17 for guiding from b to the holding portion 16a of the detour cam 16 is provided.

The path switching means 17 has a switching plate 20 whose right end is pivotally supported on a plate member 15 by a pin 18 so that the switching plate 20 can be connected to the plate member 15 as shown in FIG.
As shown in FIG. 5, it is housed in a slit-shaped recess 21 formed in the plate-like member 15. The recess 21 is located at the center of the thickness of the plate member 15 (see FIG. 5) and
Is formed from the top of the ridge 6b to the rear side of the holding portion 16a of the bypass cam 16 and from the upper surface of the plate member 15 to a depth slightly lower than the top of the ridge 6b of the opening cam 5. . A pin 22 is provided upright at an intermediate position of the switching plate 20, and the pin 22 protrudes outside through an arc-shaped groove 23 formed in the plate-like member 15. A tension spring 24 is provided between the projection and the plate-like member 15.
The switching plate 20 is normally held in the horizontal state in FIG. In this state,
The left end of the upper surface 20a of the switching plate 20 coincides with the upper surface at the top of the ridge 6b of the opening cam 5, and the right end of the upper surface 20a of the switching plate 20 coincides with the upper surface of the holding portion 16a of the bypass cam 16. . And the cam follower 14
Are the upper surface 20a of the switching plate 20 and the cam surface 6 of the opening cam 5.
(See FIG. 5) and the upper surface 20 of the switching plate 20.
a and the cam surface of the bypass cam 16.
Therefore, when the open arm 7 is retracted, the cam follower 1
4 moves from the crest 6b of the opening cam 5 to the holding portion 16a of the bypass cam 16 via the switching plate 20. On the other hand, when the open arm 7 moves forward, the switching plate 20 is pushed up by the cam follower 14 moved from the valley 6a to the peak 6b of the open cam 5 to allow the cam follower to pass therethrough. At this time, the switching plate 2
In order to prevent 0 from being greatly pushed up by the cam follower 14, the lower surface 20b of the switching plate 20 is formed in an arc shape along the cam surface of the peak 6b.

In the above configuration, first, the two boxes 2 are carried into a predetermined position by the transport means 3 in a state where the opening arm 7 is located at the retracted position by the rodless cylinder 8. When the transport means 3 is stopped and the box 2 is set at the open position, the open arm 7 is advanced by the rodless cylinder 8. Then, as described above, the lower end of the open arm 7 is inserted into the box 2 and engaged with the front flap 2a, and the front flap 2a is opened forward by the open arm 7. And at this time
The switching plate 20 is provided between the valley 6a and the hill 6b of the opening cam 5.
Is pushed up by the cam follower 14 that is moved to allow the cam follower to pass through. When the open arm 7 is moved to the forward end, the open arm 7 is immediately retracted rightward by the rodless cylinder 8. As a result, the opening arm 7 is guided from the top of the peak portion 6b to the holding portion 16a of the bypass cam 16 via the upper surface of the switching plate 20, and further passes through the slope portion 16b of the bypass cam 16 and falls by its own weight. The opening cam 5 is returned to the original retracted position, that is, to the upper portion on the rear side of the valley portion 6a of the opening cam 5. During this retreat, the lower end of the open arm 7 returns to the original retracted position through a position higher than the box 2 as shown by the imaginary line in FIG. Therefore, at the same time when the opening arm 7 starts retreating, the transport means 3 is operated, so that the processed box 2 can be carried out and a new box 2 can be carried in.

In the above embodiment, the transport means 3 is operated intermittently. However, the present invention is not limited to this, and the transport means 3 can be operated continuously.

[0012]

As described above, according to the present invention, it is possible to prevent the interference with the box by holding the open arm in the raised state when the open arm is moved backward and forward by the driving means. Since the box can be carried out to a position where the box does not interfere with the opening arm, the processing capability of the front flap opening apparatus can be improved as compared with a conventional apparatus in which the opening arm is retracted.

[Brief description of the drawings]

FIG. 1 is a front side view showing one embodiment of the present invention.

FIG. 2 is a front view showing an open arm 7 and a slider 10;

FIG. 3 is a side sectional view showing an open arm 7 and a slider 10;

FIG. 4 shows an opening cam 5, a detour cam 16 and a switching means 1.
Front side view showing 7

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Front flap opening device of box 2 ... Box 2a ... Front flap 3 ... Conveying means 5 ... Opening cam 6 ... Cam surface 6a ... Valley 6b ... Crest 7 ... Opening arm 8 ... Rodless cylinder 10 ... Slider 14 ... Cam follower Reference Signs List 16 detour cam 16a holding part 16b slope part 17 path switching means 20 switching plate 20a upper surface 20b lower surface

Claims (2)

[Claims] 1. A conveying means for conveying a box, an open arm engaged with a front flap of the box, a driving means for moving the open arm forward and backward, and a cam follower provided on the open arm for engaging and releasing the open arm. An opening cam for raising and lowering the arm in accordance with the movement of the arm, wherein the opening cam is formed continuously with the valley for lowering the opening arm and engaging with the front flap of the box, A front flap opening device for a box having a crest for raising the opening arm and opening a front flap when the opening arm advances, wherein a crest and a valley of the opening cam are connected to each other; A reversing cam having a holding portion for holding the reversing cam in a raised state when retreating, and connecting the cam follower to a valley of the opening cam at a connection portion between the peak of the opening cam and the detour cam when the opening arm advances. Allowing movement of the Luo crests, front flap opening device of the box, characterized in that a path switching means for guiding the cam follower from the crest of the opening cam to the bypass cam during retraction of the open arms. The path switching means includes a switching plate having a base connected to the detour cam and a distal end connected to and separated from the opening cam, and the distal end of the switching plate normally contacts the opening cam. When the open arm is retracted, the cam follower is guided from the peak of the open cam to the bypass cam, and when the open arm is advanced, the cam follower is pushed up by the cam follower to allow passage of the cam follower. A front flap opening device for a box according to claim 1.