JPH0655726A - Detecting device for leaf feeding position of stamping press - Google Patents

Abstract

PURPOSE:To make it possible to feed a metal leaf exactly and to set a length for regulation of a feeding position to be large while detecting a mark formed on the leaf by a photosensor, on the occasion when the leaf is fed out from a feed roller, superposed on a sheet material and pressed by stamping dies of upper and lower boards and thereby the leaf having a shape, a pattern, a character or the like formed thereon is stuck on the sheet material. CONSTITUTION:A photosensor 15 is provided inside a cylindrical body having the same cylindrical surface as an idle roller 13 with which a leaf 9 is brought into contact, and thereby a distance between the photosensor and the leaf is maintained to be fixed. Besides, a fixing shaft 41 to which the cylindrical body is fixed is rotated by a rotating mechanism. Thereby the position of the photosensor can be shifted in the direction of the circumference of the idle roller and thus a length of shifting is enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foil stamping machine for sticking a metal foil to a sheet material made of paper, plastic, leather or the like, and more particularly to a structure of a detecting device for detecting the feed amount of the foil by an optical sensor.

[0002]

2. Description of the Related Art Generally, a foil stamping machine stacks a metal foil on a sheet material made by cutting paper, plastic sheet, leather or the like and presses a mold from both sides. In this mold, a desired shape, pattern, characters or the like to which the foil is to be attached is formed. Further, this mold is usually provided with a heater, and the foil is attached by the heat of the heater.

In recent years, foils having shapes, patterns, characters, etc., have been provided in advance. In this case, the mold only has a simple shape. There is a so-called holographic foil as a representative of the foil having the shape, the pattern, the characters and the like. This holographic foil is excellent in design because its shape and pattern appear three-dimensional by hologram technology, and various colors are classified according to the angle of light.

The foil having the shape, pattern or characters (hereinafter referred to as a pattern or the like) as described above must be accurately fed to a predetermined position of the sheet material on which the foil is pressed.
That is, if the foil is not patterned as usual, this feeding does not have to be so accurate, and even if there is some variation, if the feeding of the sheet material is accurate, it will be formed in the mold. A pattern made of foil or the like is attached to a correct position according to the formed pattern or the like. However, the above variation is not allowed in the foil having a pattern or the like, and the variation causes the pattern or the like to be stuck at an incorrect position on the sheet material.

In order to accurately carry out the feeding of the foil, it is considered that a mark is formed on the surface of the foil and the foil is fed while the mark is detected by a sensor.

[0006]

However, the sensor is provided at a location where the foil moves linearly while the unused strip-shaped foil is being fed from the feed roller toward the board for pressing the foil. Are considered to be common (eg West German Patent Publication 3713666).
If the distance between the optical sensor that detects the mark and the foil on which the mark is formed is not substantially constant, a detection error may occur.

Further, in order to eliminate such a detection error, it is necessary to provide guides for guiding the foil on both sides of the strip-shaped foil which makes a rectilinear motion so as to eliminate the shake in the direction orthogonal to the rectilinear motion. . Moreover, in order to adjust the feeding position of the foil with respect to the sheet material, the position of the sensor must be moved along the moving direction of the foil. However, there is a possibility that this moving distance becomes large and the detection device becomes large. In particular,
If the guide for guiding the foil is provided, the guide also has to be moved, which further increases the size.

The present invention has been made to solve the above problems, and eliminates a detection error due to a shake of the foil, and prevents the apparatus from becoming large in size as the position of the sensor is moved. It is intended to provide feed position detection.

[0009]

In order to achieve the above object, the present invention provides a detection device for detecting the feeding position of a foil of a foil stamping machine for sticking a foil to a sheet material by hot foil stamping.
An idle roller provided between a feed roller that sends out unused strip-shaped foil and a board that performs foil pressing and in contact with the foil, a fixed shaft that serves as a rotation center of the idle roller, and the idle roller fixed to the fixed shaft. A cylindrical body having substantially the same cylindrical surface as described above, an optical sensor provided inside the cylindrical body for detecting a mark on the foil surface from a window formed in the cylindrical surface, and a position of the optical sensor for rotating the fixed shaft. And a foil feed position detection device of a foil stamper having a rotating mechanism for moving the.

[0010]

The unused strip-shaped foil is sent out from the feed roller, comes into contact with the idle roller, and goes to the board for foil pressing. In the idle roller, the foil moves with the idle roller in a circumferential direction. This circumferential movement keeps the foil in focus with respect to the cylinder having the same cylindrical surface as the idle roller. An optical sensor provided inside the cylindrical body detects a mark on the surface of the foil through a window having a cylindrical surface.

To adjust the feeding position of the foil, the fixed shaft is rotated by the rotating mechanism, and the position of the optical sensor is moved in the circumferential direction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. FIG. 1 is a schematic view of the entire foil stamping machine according to this embodiment.
In this foil stamping machine 1, the board for performing the foil stamping operation is composed of a surface plate 3 fixed to the main body of the foil pressing machine, and a moving board 5 that comes up from below the surface plate 3 and contacts the lower surface of the surface plate 3. Become. Plate 3
A metal mold 7 for forming a foil to be attached into a desired shape is provided on the lower surface of the. A heater for heating the mold 7 is provided inside. Since the foil in this embodiment is a holographic foil and a pattern or the like is already attached to the foil, the shape of the mold 7 is often a simple shape such as a square or a circle.

A foil 9 sent between the surface plate 3 and the moving platen 5.
Has a long strip. One end of the foil 9 is wound around the feed roller 11 in an unused state. The foils 9 can be arranged in a plurality of rows in a direction perpendicular to the feeding movement direction, so that a plurality of feed rollers 11 and the like can be provided. The feed roller 11 is the belt 12
A tension that tends to rotate the foil 9 in the direction opposite to the feeding direction is given by the motor 14 via the. This tension prevents the foil 9 sent out from becoming loose.

The foil 9 sent out from the feed roller 11
Is wound around and touches the idle roller 13. An optical sensor 15 is provided on the idle roller 13 as described later. The foil 9 coming out of the idle roller 13 is guided by the guide roller 17 and sent between the surface plate 3 and the moving plate 5. The foil 9 that has left the board is further guided by another guide roller 17 and sandwiched by the pull roller 19 and the pressing roller 21 to be pulled. Then, it is guided by the guide roller 17 and wound around the wind roller 23. The wind roller 23 has a function of sequentially winding the foil 9 as the foil pushing operation proceeds. The pull roller 19 and the wind roller 23 are
As will be described later, control is performed in accordance with a detection signal from the foil feed position detection / detection device having the optical sensor 15.

The sheet material 25 is sent by a clamper 29 provided on the loop chain 27. That is, the forward side of the loop chain 27 passes between the surface plate 3 and the moving plate 5. The return side bypasses the upper side of the surface plate 3, the feed roller 11, the idle roller 13, the pull roller 19, the wind roller 23, and the like. The loop chain 27 is provided in two rows in parallel, a clamper bar is provided between the loop chains 27, and a plurality of clampers 29 are provided on the clamper bar. The clamper 29 mechanically clamps the sheet material 25 at the beginning of the forward movement side. Then, the sheet material 25 is sent out by mechanically unclamping it on the rear side on the forward side. The loop chain 27 is guided by a chain guide 31. Further, it is driven in the feeding direction by the drive sprocket 33.

FIG. 2 shows the relationship between the sheet material 25 and the foil 9 in this embodiment. The foil 9 of this embodiment is a holographic foil, and patterns 35 and the like are attached at predetermined intervals by the hologram technique. There are unavoidably small errors in this interval. If this error accumulates, the pattern etc. 3
5 cannot be accurately fed to the predetermined position of the sheet material 25. Therefore, a mark 37 for detecting the position of the pattern 35 is formed near the pattern 35. The mark 37 has a light reflectance different from that of the surrounding portion and can be detected by the optical sensor 15. Further, a plurality of marks 37 are provided for one pattern or the like 35 to give a degree of freedom to the setting position of the optical sensor 15 in the width direction.

3 to 6 show the idle roller 13 which is provided with the optical sensor 15 therein and constitutes the foil feeding position detecting apparatus according to the present embodiment. That is, the fixed shaft 41 is fixed to the frame 39, and the idle roller 13 is rotatably provided with the fixed shaft 41 as the center of rotation.
The idle roller 13 is composed of a plurality of short cylindrical idle bodies 45.
Are connected in the axial direction.

A cylindrical body 47 is provided between two adjacent idle bodies 45 among the plurality of idle bodies 45, and is fixed to the fixed shaft 41. The cylindrical surface of the cylindrical body 47 is substantially flush with the cylindrical surface of the idle roller 13. The structure of the cylindrical body 47 is shown in FIGS. The base 49 of the cylindrical body 47 has a substantially short cylindrical shape, and
In the split state, it can be fixed to the fixed shaft 41 by a bolt screwed into the bolt hole 51. A groove 53 is formed in a circumferential direction on an outer peripheral end surface of the base 49,
The front view (FIG. 7) is H-shaped. The front surface side of the bottom surface 55 of the groove 49 is a flat mounting surface 57. An L-shaped mounting bracket 61 is fixed to the mounting surface 57 with a screw 59. The optical sensor 15 is attached to the tip of the attachment bracket 61. This optical sensor 15
It is desirable that the angle θ between the optical axis 65 and the tangent line 67 at the position where the optical axis 65 intersects with the foil 9 be the optimum angle for detecting the mark. In this embodiment, θ is 30 degrees. However, this θ can be easily adjusted by changing the L-shaped angle of the mounting bracket 61.

A belt-shaped sensor cover 6 is provided on the groove 53.
9 is provided. The sensor cover 69 is made of metal and is firmly fixed on the base 49 by elastic force. A plurality of elongated holes 71 are provided in the circumferential direction of the sensor cover 69. This long hole 71 is the optical sensor 15.
Used as a window for detecting the mark 37 on the foil 9.

As shown in FIGS. 3 and 4, the rotating mechanism 73 for rotating the fixed shaft 41 about its axis is a worm gear 75.
And a pinion gear 77. That is, the fixed shaft 4
A pinion gear 77 is formed at one end of 1. Worm gear 75 meshing with this pinion gear 77
Is provided on the frame side. The worm gear 75 is provided with a handle 79. The handle 79 rotates the fixed shaft 41, and thus the position of the optical sensor 15 can be easily moved. This movement is performed by the idle roller 13
Along the circumference of. A signal indicating that the mark 37 is detected by the optical sensor 15 controls the pull roller 19, the wind roller 23 and the like via a control device (not shown).

The operation of this embodiment will be described below with reference to FIGS. First, by adjusting the positional relationship between the idle body 45 and the cylindrical body 47 that form the idle roller 13, and further by adjusting the position in the width direction of the feed roller 11 with respect to the idle roller 13, the width direction of the foil 9 is adjusted. Which of the plurality of marks 37 is used to detect the optical sensor 15 is selected. Next, the position of the optical sensor 15 is aligned with the position of the first mark in the selected row of marks 37.

Then, the distance L ₁ for high speed feeding and the distance L ₂ for low speed feeding are set (FIG. 8). That is, since the marks 37 are provided at substantially predetermined intervals, the feeding speed of the foil 9 is lowered in the vicinity of the marks 37 so that the detection can be reliably performed. Further, the optical sensor 15 is provided so as not to erroneously detect the reflected light from the foil 9 between the marks.
The operation of is performed only when the low speed feeding or the like is performed.

As shown in FIG. 9, the foil stamper 1 is turned on to start the apparatus (1). At first, high-speed feeding is performed (2), and the foil 9 is fed at high speed to enhance the efficiency of the foil pressing operation. When this feeding is carried out for a certain distance L ₁ , (3) it is switched to low-speed feeding (4), and the optical sensor 15 operates (5).
When the next mark 37 is detected by this optical sensor 15,
(6), the feeding operation is stopped (7). In this stopped state, the moving platen 5 moves up and the foil pressing operation is performed. When a certain period of time has passed (8) and it is considered that the foil stamping operation has ended, it returns to the beginning and high-speed feed (2) is restarted. If the mark 37 is not detected and the constant distance L ₂ is passed by the low speed feed (9), the alarm buzzer is activated (10), and the maintenance is stopped (11). If a certain distance has passed without detecting the mark, it means that the unused foil 9 fed out by the feed roller 11 has been exhausted, or the optical sensor 15 did not operate normally. Do and start again
Return to (1). When it is desired to finely adjust the feeding position of the foil, the handle 79 of the rotating mechanism 73 is rotated to move the position of the optical sensor 15 along the circumferential direction of the feed roller 13. Thereby, the feed position can be finely adjusted even while the foil stamping machine 1 is in operation.

As described above, according to this embodiment,
Since the foil 9 moves in the circumferential direction together with the idle roller 13 while being in contact with the idle roller 13, the foil 9 can be kept taut. Therefore, the foil 9 does not shake in a direction (thickness direction) perpendicular to the movement direction of the foil 9. Because of this blurring, the distance from the optical sensor 15 is also kept constant. Therefore, it is possible to avoid the detection error caused by the variation of the distance.

Further, the apparatus is simplified because there is no need for guides for guiding both sides of the foil 9 in order to eliminate the blur at the position where the foil 9 makes a rectilinear motion. Further, the optical sensor 15 is used to adjust the feeding position of the pattern 35 of the foil 9 or the like.
Since the position is moved in the circumferential direction, the space for the movement is smaller than that in the case where the position is moved in the straight direction. Therefore, it is possible to avoid increasing the size of the device to secure this space. Furthermore, this saving of space becomes even more effective than if the guides for guiding the foils performing the rectilinear motion also have to be moved together with the optical sensor.

Further, since the optical sensor 15 is protected by the sensor cover 69 and is exposed to the outside only through the long hole 71 necessary for detecting the mark 37, the exposed portion is small, and the foil stamping machine 1 is maintained and inspected. It is possible to prevent an accident such as accidentally touching and breaking the optical sensor 15 at the time of the above. The sensor cover 69 can be attached and detached with one touch due to its elasticity, which facilitates maintenance and inspection.

In the above embodiments, the foil 9 is a holographic foil, but in other embodiments, the foil 9 is not a holographic foil, but the pattern or the like is formed by a technique other than the hologram technique, for example, unevenness. Even one
Accurate feeding to the sheet material is required, and therefore the effects of the present invention can be obtained. In the above examples,
The window formed on the cylindrical surface is the long hole 71 of the sensor cover 69.
However, in other embodiments, the window is not limited to the long hole 71, and a window may be obtained by employing, for example, a mesh-shaped sensor cover.

In the above embodiment, the rotating mechanism 73 for moving the position of the optical sensor 15 is composed of the worm gear 75 and the pinion gear 77. However, in other embodiments, other mechanism may be used. Good. For example, the fixed shaft may be rotated by a long arm provided on the fixed shaft 41. In the above embodiments, one foil stamper 1 is used to feed a plurality of foils 9. However, in other embodiments, only one foil may be fed. In this case, one feed roller 11 and one wind roller 23 are provided.

[0029]

As described above, according to the foil feeding position detecting device of the foil stamping machine of the present invention, the foil which moves in the circumferential direction while being in contact with the idle roller can maintain the taut state. Since there is no blurring in the direction perpendicular to the direction, the distance from the optical sensor can be made constant, and therefore the detection error can be eliminated.

Further, the position of the optical sensor for adjusting the feeding position of the foil can be moved in the circumferential direction, and it is possible to prevent the detection device from becoming large in size as compared with the case of moving in the linear direction.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of an entire foil stamping machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the relationship between the foil and the sheet material in FIG.

FIG. 3 is an enlarged view showing a main part of FIG.

FIG. 4 is a view showing the main part of FIG. 3 as viewed from the direction A.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a front view showing the appearance of FIG.

FIG. 7 is a front view showing a state where the sensor cover of FIG. 5 is removed.

FIG. 8 is a relationship diagram between a feed rate and a control signal shown to explain the control of the present embodiment.

FIG. 9 is a flowchart showing the control of this embodiment.

[Explanation of symbols]

 3 Surface plate 5 Moving plate 7 Type 9 Foil 11 Feed roller 13 Idle roller 15 Optical sensor 17 Guide roller 19 Pull roller 21 Pressing roller 23 Wind roller 25 Sheet material 27 Loop chain 29 Clamper 31 Chain guide 33 Drive sprocket 35 Pattern etc. 41 Fixed shaft 45 Idler body 47 Cylindrical body 49 Base 53 Groove 57 Mounting surface 59 Screw 61 Mounting bracket 69 Sensor cover 71 Long hole (window) 73 Rotating mechanism 75 Worm gear 77 Pinion gear

Claims (1)

[Claims] 1. A detection device for detecting a foil feeding position of a foil stamping machine for sticking foil to a sheet material by hot foil stamping, which is provided between a feed roller for feeding an unused strip-shaped foil and a board for foil stamping. An idle roller that is in contact with the foil, a fixed shaft that is the center of rotation of the idle roller, a cylindrical body that is fixed with respect to the fixed shaft and has substantially the same cylindrical surface as the idle roller, and a cylinder that is provided inside the cylindrical body. A foil feed position detection device for a foil stamper including an optical sensor for detecting a mark on the foil surface from a window formed on the surface and a rotating mechanism for rotating the fixed shaft to move the position of the optical sensor. .