JPS59225939A - Method and device for correcting strain of blank - 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 blank distortion correction method and apparatus. A box-making machine is usually used to manufacture folding boxes. In general, in a case-making machine, a conveyor belt holds and conveys a blank with creases, and during the conveyance, the blank is folded along the folds. The blanks are then folded, glued, and pressed to dry. However, when the blanks are conveyed correctly, a part of the conveyor belt may loosen or the blanks may slip into the box making machine. Blank folds may not be folded correctly from the fold line for various reasons, such as the feed not being fed at a predetermined angle with respect to the conveyor belt.

In such a case, gluing the blank may sometimes cause distortion of the surface, resulting in deterioration in product quality and product loss. This is particularly noticeable in the case of rectangular and shallow boxes.

Conventionally, methods for correcting distortion of this blank include, for example,
It is known to temporarily deposit folded and glued blanks in a straightening hopper in which the folds are pressed from both sides to straighten the distortion.

However, according to this method, the glued blanks are released from the conveyor belt and stacked in the hopper, so especially in the early stages of stacking, the glued parts are affected by the restoring force of the folds of the blanks. Not only is there a risk that the blanks may lift up from the bends, resulting in incomplete adhesion or product loss, but the straightening speed is limited because the distortions are corrected after a predetermined amount of blanks have been deposited in the hopper. There is a limit, which is a factor that hinders speeding up mass production, and a correction device having a relatively complicated structure is required to simply correct the distortion of the blank during conveyance.

The present invention was completed as a result of various experiments and research in order to solve the above-mentioned problems.A blank that is conveyed while being held by a conveyor belt is folded into a predetermined shape during conveyance, glued, and pressed. Conveyor bell F that grips and conveys folded blanks in the method of drying and forming into boxes
A box making machine in which blanks are held and conveyed by a plurality of pairs of conveyor belts that correct the distortion of folded blanks by changing the traveling speed of one side relative to the other. , the transmission is characterized in that a transmission is interposed on the rotating shaft of at least one of the upper and lower conveyor belts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a blank distortion correction method and apparatus according to the present invention will be described with reference to the attached drawings.

- four series of side plates 2 to 5 with glued portions 1 formed on the side edges, lid plates 6 to 9 formed on the upper side of each side plate 2 to 5, and the lower side of each side plate 2 to 5; The bottom plates 12 to 15 configured as shown in FIG.
0.11, with folds 16 to 2 on each boundary.
The blank A provided with the belt 9 is conveyed while being held by a plurality of pairs of known conveyor belts 30 to 33 provided in upper and lower pairs.

During this transport, the glued part 10.11 of the bottom plate 12.14 is folded outward (downward) from its fold 28.29 in a known manner, and at the same time all the bottom plates 12 to 15 are After folding inward (upper side) from those folds 24 to 27, glue is applied to the glued parts 10 and 11 of the bottom plate 12 and 14 and the glued part 1 of the side plate 2, and Face plate 2.
5 is folded from the folds 17 and 19, and the folded box A1, which has been folded and glued, is held between two pairs of conveyor bells) 34 and 35, and is placed in a pair of upper and lower parts in the straightening device B. It is sent between two pairs of conveyor belts 36 to 39 that are connected to each other. Among these conveyor belts 36 to 39, the upper conveyor belts 36 and 37 are connected via boots 942 and 43 provided on rotation shafts 40 and 41, respectively, which are rotatably mounted on the frame B1 of the straightening device B. Then, from the carry-in side of the folding box A1, the conveyor belt 44 of the press drying device C is
It is stretched to the top, and the lower conveyor belt 38.39cm is driven by the motor 50, the reducer 68, and the sprocket 45.46cm.
, are stretched from the carry-in side of the folding box A1 to the top of the conveyor belt 44 of the press drying device C via pulleys 49 (one omitted) separately attached to a rotating shaft 48 rotated via a chain 47. Ru.

On the outer surface of the straightening device B, fixed-diameter pulleys 51 and 52 are respectively attached to the shaft ends of the rotating shafts 40 and 41, and variable V-boots IJ53 and 52 are respectively attached to their sides.
54 is attached, and between one constant diameter V pulley 51, one variable boolean 1 no.
V-belts 55 and 56 are attached respectively.

Shaft 63a1 with variable V boo IJ53.54 attached
Sprockets 57 and 58 are attached to each of 64 &, and chains 61 and 62 are respectively attached to a pair of sprockets 59 and 60 attached to the rotating shaft 48.
The stake is passed. The variable V pulleys 53 and 54 each have a known adjuster 63 and 64 for adjusting their diameter.
are provided, and by adjusting the regulators 63, 64, the rotational speed of the constant diameter V-pulleys 51, 52 is changed. Therefore, one of the upper conveyor belts 3
6 is a reduction gear 1681, a sprocket 45, a chain 47, a sprocket 46, a rotating shaft 48,
sprocket 59, chain 61, sprocket 57,
Variable V pulley 53, V belt 55, constant diameter V pulley 51,
The other conveyor belt 37 on the upper side is driven via the rotation shaft 40 and the pulley 42, and the motor 5o drives the rotation shaft 48, the sprocket 60, the chain 62, the sprocket 58, the variable pulley 54, and the belt. 56, constant diameter ■
It is driven via the pulley 52, rotation shaft 41, and pulley 43.

Further, one of the lower conveyor belts 38 is connected to the rotating shaft 48.
, and the other conveyor belt 39 on the lower side is driven via the rotary shaft 48, a pulley attached to the rotary shaft 48 (not shown).

On the sending side of the folding box A1 of the straightening device B, there is a wide conveyor belt 44, one end of which is disposed directly below the tips of the conveyor belts 36 to 39 in the straightening device B; The pressing belt 65, which is a flat belt that is in contact with the top surface of the folding box A2, which has been glued and whose distortion has been corrected, and which is dried while being transported while pressing the top surface of the folding box A2, which is in contact with the top surface and whose distortion has been corrected, is pressed against the tips of the transport belts 36 to 39 of the straightening device B. A pair of auxiliaries arranged on the conveyor belt 44 for feeding the folding box A2, which is disposed between the belts 65 and conveyed by the conveyor belts 36 to 39, between the conveyor belt 44 and the pressing belt 65. A known press drying device C consisting of feeding devices 66 and 67 is installed.

The case where the distortion of the glued folding box A1 is corrected using the device configured as described above will be explained together with the operation of the device.

When the blank A manufactured by a known method is folded and glued by a known method to create a folded box A1 and transported to the straightening device B, as shown in the second diagram, a side plate 2 When the side plate 5 is distorted and attached to the cover plate 6 side and the side plate 5 is distorted to the bottom plate 15 side and pasted by the adhesive part 1, the side plate 2 is distorted to the bottom plate 12 side, and the side plate 5 is distorted to the bottom plate 12 side. All you have to do is shift it toward the cover plate 9 side and align the bottom surfaces. To do this, the upper conveyor belt 36 of the conveyor belts 36.3B that clamps the side plate 2.3 portion is run faster than the lower conveyor belt 38, and the side plate 4.5 portion is clamped. If the upper conveyor belt 37 is run slower than the lower conveyor belt 39, the side plate 2 will move toward the bottom panel 2, and the side plate 5 will move toward the cover plate 9. The folding boxes A1 are pulled together by the contact resistance with the conveyor belts 36 and 37, so while the folding boxes A1 are continuously carried into the straightening device B, the adjuster 6 is moved until the bottom surfaces are aligned.
3.64 to adjust the running speed of each conveyor belt 36,37.

That is, by adjusting the adjuster 63, the diameter of the variable pulley 53 is gradually increased, and the rotational speed of the constant diameter V pulley 51, rotating shaft 40, and pulley 42 is increased to increase the running speed of the conveyor belt 36, and the folding The bottom of the side plate 2 of the tatami box A1 is connected to the other side plate 3.
Adjustment is completed when the variable V pulley 54 is aligned with the bottom surface of The rotating speed of the pulley 43 is lowered to reduce the running speed of the conveyor belt 37, and the bottom surface of the side plate 5 of the folding box A1 is aligned with the other side plate 3.
．． Adjustment may be completed when the adjustment is aligned with the bottom surface of No. 4.

In this way, the folding box A2 with the distortion of the glued folding box A1 corrected is transferred to the conveyor belt 44 of the press drying device C.
These folding boxes A2 are sent to the auxiliary feeding device 6.
6.67 is held between the conveyor belt 44 and the press belt 65
and the conveyor belt 44, and are pressed and dried.

In the above example, the case where a simple folding box is created is shown, so gluing is a method for correcting distortion when there is a distortion in the folding box A1 afterward. When making a folding box, even if gluing is done in a previous step, if it is necessary to correct the distortion of the folded box, it is of course possible to correct it by the method of the present invention.

Furthermore, the apparatus for carrying out the method of the present invention is not limited to the configuration shown in the drawings; for example, the means for changing the running speed of the conveyor belts 36 to 39 for straightening may be a constant diameter V-boot IJ51.52 or a variable V-boot IJ51.52. A simple known continuously variable transmission may be used instead of the pulleys 53 and 54, and even if the running speed of the upper and lower conveyor belts 36 to 39 on which the folding box A1 is held is variable, the upper and lower Both conveyor belts 36 to 3
9 may be made variable. Furthermore, instead of using an independent unit as a straightening device, a structure like the one in the embodiment may be installed in a continuous manner in an appropriate conveyance path for blanks or folding boxes.

As described above, the present invention corrects the distortion of the folded blank by changing the running speed of one of the conveyor belts that grips and conveys the folded blank relative to the other. As a result, the folded blank is always held between the conveyor belt and there is no room for the restoring force of the blank to act on the folded part, resulting in peeling of the glued part and product loss. There is no risk of this happening, and the device according to the present invention simply requires a simple belt running speed variable device such as a transmission to be installed on the rotating shaft of the conveyor belt in the blank clamping conveyance path. , there is no need for a particularly complicated device as a distortion correction device.

In addition, since the distortion of the blank can be corrected while the blank is being transported, it can be corrected more accurately and quickly than a method in which a plurality of blanks are piled up once and then corrected, which is suitable for mass production. If the apparatus shown in the embodiment is used, the running speed of the conveyor belt can be changed simply by adjusting the adjuster, and the operation is simple.

[Brief explanation of the drawing]

What is shown is an example of a blank and an apparatus used to carry out the method of the present invention. Fig. 1 is a plan view of the blank, Fig. 2 is a plan view of the main parts of the apparatus, and Fig. 3 is a plan view of the apparatus. FIG. 3 is a side view of main parts. A...Blank A1, A2...Folding box B...
- Straightening device C...press drying device 30 to 39
... Conveyor belt 40.41 ... Rotation shaft 42.4
3... Pulley 44... Conveyor belt 50.
...Motor 51.52...Constant diameter V pulley 5
3.54...Variable V pulley 55.56. ... ■Belt 63a164a...Shaft 63.64...Adjuster 65...Press belt Patent applicant Tanabe Shiko Machine Manufacturing Co., Ltd.

Claims (2)

[Claims] (1) A blank that is conveyed while being held by a conveyor belt is
In a method in which the blank is folded into a predetermined shape during conveyance, glued, compressed and dried to form a box, the running speed of one of the conveyor belts that grips and conveys the folded blank is determined relative to the other. A blank distortion correction method characterized by correcting distortion of a folded blank by changing the . (2) In a box making machine in which blanks are held and conveyed by a plurality of pairs of upper and lower conveyor belts driven by a motor, etc., a transmission is installed on the rotating shaft of at least one of the upper and lower conveyor belts. A blank distortion correction device characterized by being interposed with.