JPH0230274Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a paper positioning device used, for example, in an automatic box making machine.

Automatic box making machines automatically fold and assemble paper such as cardboard that has been cut into a predetermined shape.
For example, one disclosed in Japanese Utility Model Application Publication No. 58-15030 is known.

The main parts of this system are a paper feeding mechanism, a belt feeding and folding mechanism, a press roller mechanism, an ejection mechanism, an upper and lower folding mechanism, a folding mechanism, a lower feeding mechanism, and an unloading conveyor. The paper is fed horizontally to the vertical folding mechanism, and then fed downward.

For this reason, a paper positioning device is provided in the vertical folding mechanism to stop the paper fed in the horizontal direction at a predetermined position so that the paper can be moved downward without any hindrance.

Conventional paper positioning devices are comprised of a simple stopper, the rear end of which is pushed by a protruding mechanism so that the front end of the paper being fed comes into contact with the stopper.

Such a paper positioning device can position relatively thick paper or stiff paper at a predetermined position without any problem.

However, when relatively thin and stiff paper is used, when the rear end of the paper is pushed due to the protrusion mechanism, the rear end may bend and the front end of the paper may not come into contact with the stopper. The paper pushed out by the ejection mechanism hits the stopper too strongly, causing the front end of the paper to bend or bend, which often makes it impossible to position the paper at a predetermined position.

As a result, subsequent work could not be carried out properly and defective products continued to be produced, which was extremely problematic.

This invention was devised to solve the problems mentioned above, and its purpose is to:
To provide a paper positioning device capable of accurately positioning even relatively thin or stiff paper at a predetermined position.

The paper positioning device of the present invention includes a fixed body, a movable body that can move back and forth relative to the fixed body, and a movable body that is pivotally connected to the left and right horizontal axes so that the peak point is located behind the left and right horizontal axes. a gripping cam body arranged on the
Grasping elasticity that is provided on the movable body, exhibits a horizontal state, and can resiliently abut against a contact point near the front side of the peak point of the gripping cam body to receive and clamp the leading edge of the paper between the gripping cam body and the gripping cam body. an elastic body that is interposed between the movable body and the gripping cam body and urges the abutting portion of the gripping cam body to come into contact with the gripping elastic body; and a gripping cam body that is provided on the fixed body. and a stopper body that can come into contact with the movable body gripped by the gripping elastic body during its backward movement.

In other words, the leading edge of the paper being fed is received and gripped by the gripping cam body and the gripping elastic body, and by retracting these, the paper is pulled in. During the retraction, the leading edge of the paper comes into contact with the stopper body. This allows the paper to be positioned at a predetermined position.

According to the present invention, since the paper that has been fed is not positioned simply by making it come into contact with the stopper, even relatively thin or stiff paper can be accurately positioned at a predetermined position. As a result, subsequent work can be carried out properly without causing any trouble.

Furthermore, according to the present invention, the paper gripping mechanism is composed of the gripping cam body, the gripping elastic body, and the elastic body, so that the paper can be inserted, received, gripped, slidably held, and removed extremely smoothly. The paper is not bent, wrinkled, damaged, or stained at all.

In addition, since the structure is relatively simple, there is no fear of failure and the cost is low.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing the structure of a paper positioning device according to an embodiment of the present invention, and FIG. 2 is a front view thereof.
3 to 6 are front views of main parts for explaining the operation.

The main parts of the paper positioning device 1 include a fixed body 2, a movable body 3, a gripping cam body 4, a gripping elastic body 5, an elastic body 6, and a stopper body 7.

The fixed body 2 is attached to the fixed side, and is attached instead of a stopper provided at the vertical folding mechanism of an automatic box making machine, for example.

In this example, approximately horizontal T
It's following a pattern.

The movable body 3 can move back and forth relative to the fixed body 2.

In this example, the vertical member and the horizontal member extending forward from the middle form a substantially horizontal T-shape, and are arranged on the front side of the fixed body 2.

A guide mechanism 8 and a drive mechanism 9 are interposed between the fixed body 2 and the movable body 3.

The guide mechanism 8 includes a guide boss 10 provided on the upper part of the vertical member of the fixed body 2, and a guide shaft that is fixedly provided on the upper rear surface of the vertical member of the movable member 3 and is slidably inserted into the guide boss 10. 11, and the drive mechanism 9 is constituted by an air cylinder interposed between the lower portions of the vertical members of the fixed body 2 and the movable body 3, respectively.

The gripping cam body 4 is pivotally connected to the movable body 3 by a left and right horizontal axis 12, and its peak point P is aligned with the left and right horizontal axis 1.
It is arranged so that it is closer to the rear than 2.

In this example, the horizontal member of the movable body 3 is shaped like a disk, and the horizontal member of the movable body 3 is rotatably moved at an eccentric position eccentric from the center O by a predetermined distance (a position diagonally forward and above the center O). It is attached to the side.

The gripping elastic body 5 is provided on the movable body 3 and assumes a horizontal state, and elastically abuts against a contact point Q near the front side of the peak point P of the gripping cam body 4 to move the gripping cam body 4.
Paper A can be held between the two.

In this example, the spring receiving plate 13 is attached to the lower part of the vertical member of the movable body 3 so as to be adjustable and movable in the front and back direction, and the front part is bent downward to form a substantially rectangular shape, and the rear part is the spring receiving plate 13. The plate spring 14 is fixed to the upper surface of the gripping cam body 4.
A part of the upper surface of 4 is made to elastically fit together. Then,
By moving the spring receiving plate 13 back and forth with respect to the movable body 3, the distance from the tip of the spring receiving plate 13 to the contact point Q changes, thereby making it possible to vary the elasticity of the spring plate 14.

The elastic body 6 is interposed between the movable body 3 and the gripping cam body 4 and urges the abutting portion Q of the gripping cam body 4 and the gripping elastic body 5 to come into contact with each other.

In this example, it is composed of a leaf spring, and the upper end of the leaf spring is attached to the front surface of the upper part of the vertical member of the movable body 3 with a screw, and the lower end of the leaf spring is always in contact with the rear side of the gripping cam body 4. It is made to do so. Therefore, the elasticity of the leaf spring is set to such an extent that the contact point Q of the gripping cam body 4 always contacts the gripping elastic body 5, and is set to be slightly weaker than the elasticity of the leaf spring 14 of the gripping elastic body 5. There is.

The stopper body 7 is provided on the fixed body 2, and the paper A gripped by the gripping cam body and the gripping elastic body 5 can come into contact with the stopper body 7 during the backward movement of the movable body 3.

In this example, it is composed of a support member 15 in the front and rear direction and a stop plate 16 fixed to the front end of the support member 15. A long hole 17 is bored in the rear of the support member 15, and a bolt 18 is inserted through this. It is screwed onto the side surface of the fixed body 2 in the middle of the vertical member.

There are a pair of stopper bodies 7 on the left and right near both sides of the movable body 3, and the position of the stopper plate 16 is slightly rearward and away from the front end of the paper A gripped by the gripping cam body 4 and the gripping elastic body 5. is being done.

Next, the operation will be explained based on such a configuration.

FIG. 3 shows the forward position where the movable body 3 is separated from the fixed body 2 by the drive mechanism 9 the most.

Paper A moves from the left side to the right side (in the direction of the arrow) in the same figure.
For example, it is fed by a protruding mechanism (not shown).

The leading end of the paper A sent toward the paper positioning device 1 enters between the gripping cam body 4 and the gripping elastic body 5, and the clockwise rotational force of the gripping cam body 4 due to the elastic body 6 and the gripping force are generated. It is received by the elasticity of the elastic body 5,
Further intrusion is prevented and it is gripped by both bodies 4 and 5 as shown in FIG.

Next, the movable body 3 is moved to the fixed body 2 by the drive mechanism 9.
Retreat to get closer to.

When the movable body 3 begins to retreat, the paper A is pulled together. At this time, a resistance force is generated when the paper A is moved, but since the gripping cam body 4 rotates clockwise in accordance with this resistance force, there is a gap between the gripping cam body 4 and the gripping elastic body 5. , a gripping force sufficient to offset the resistance force of paper A is automatically generated. For this reason, paper A
is pulled against both bodies 4 and 5 without slipping, and during the backward movement of movable body 3, its tip abuts against plate 16 of stopper body 7, as shown in FIG.

When the leading edge of the paper A comes into contact with the stopper body 7, the paper A
In addition to the above-mentioned resistance force, a new blocking force acts. On the other hand, the gripping force generated between the gripping cam body 4 and the gripping elastic body 5 cannot exceed the sum of the resistance force and the blocking force because one of them is made of the gripping elastic body 5 having elasticity. do not have. Therefore, both bodies 4 and 5 slide backward while holding the paper A.

Then, the two bodies 4, 5 and the paper A are separated as shown in FIG. 6, and the paper A remains in a state where its leading edge abuts against the stopper body 7, and is positioned at a so-called predetermined position.

On the other hand, both bodies 4 and 5 are connected to the stop plate 16 of the stopper body 7.
It stays in a more retreated position, so that subsequent work on paper A will not be hindered.

Note that the shapes of the fixed body and the movable body, and the structure of the guide mechanism and drive mechanism provided between them are not limited to the previous embodiments, and can be appropriately changed in design.

In the previous embodiment, the gripping cam body has a structure in which disks are eccentrically connected, but the structure is not limited to this, and it may be, for example, an egg-shaped cam plate.

In the previous embodiment, the gripping elastic body used a plate spring, but it is not limited to this. For example, the gripping elastic body may be a movable body so as to be able to come into contact with the contact portion of the gripping cam body 4. It can also be constructed of a supported rigid gripping plate and an elastic body that biases it to abut the abutting portion.

The elasticity adjusting means of the gripping elastic body is not limited to the above embodiments, and the design may be changed as appropriate.

Although a plate spring was used as the elastic body in the previous embodiment, for example, a coil spring, a spiral spring, rubber, etc. may also be used.

In the previous embodiment, the left and right stopper bodies can be adjusted and moved separately, but they may be synchronized.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the structure of a paper positioning device according to an embodiment of the present invention. Figure 2 is its front view.
3 to 6 are front views of main parts for explaining the operation. 1... Paper positioning device, 2... Fixed body, 3...
Movable body, 4... Gripping cam body, 5... Gripping elastic body,
6...Elastic body, 7... Stopper body.

Claims (1)

[Scope of utility model registration request] a fixed body, a movable body that can move back and forth with respect to the fixed body, and a gripping cam body that is pivotally connected to the movable body by a left and right horizontal axis and is arranged so that its peak point is located behind the left and right horizontal axis. , a grip that is provided on a movable body, is in a horizontal state, and can resiliently abut a contact point near the front side of the peak point of the grip cam body, and can receive and clamp the leading edge of the paper between the grip cam body and the grip cam body. an elastic body, an elastic body that is interposed between the movable body and the gripping cam body and urges the abutting portion of the gripping cam body to abut the gripping elastic body; and a gripping cam provided on the fixed body. A paper positioning device comprising a stopper body with which the paper gripped by the movable body can come into contact with the paper gripped by the elastic gripping body during the retreating movement of the movable body.