JP2005088138A - Punching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching device by which a part to be punched can be accurately punched even if the part to be punched is deviated in the width direction of a material sheet (S) in the punching device in which the material sheet (S) with the parts to be punched arranged in the longitudinal direction is successively fed into a punching section (P) in a state of superposing the material sheet (S) on a base sheet (11) and the part to be punched is punched with a punching die (1) pressed to the base sheet (11) from above the part to be punched. <P>SOLUTION: The punching device is provided with a mark sensor (5), which detects a reference mark on the material sheet (S) at the punching section (P) or at its upstream side, a displacement distance calculating means for calculating a displacement distance in which the reference mark detected with the mark sensor (5) is deviated in the width direction of the material sheet (S) from a preset reference position, and a punching position correcting means for moving the punching die (1) in the deviated direction to an amount equivalent to the calculated displacement distance when the part to be punched corresponding to the reference mark detected with the mark sensor (5) reaches the punching station (P). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for punching a product from a material sheet, and accurately punches along a contour shape of a punched portion.

For example, as a punching device for punching a large number of products (A) from a long material sheet wound up in a roll shape, a structure as shown in FIG. 9 is known.
A bed (10) is placed on the upper surface of the body (K), and a punching die (1) is mounted on the lower surface of the elevating plate (35) located above the bed (10).
An endless belt-like base sheet (11) wound around an intermittently rotating drive roller (21a) and driven roller (21b) is intermittently run between the upper and lower sides of the bed (10) and the punching die (1). At the same time, the material sheet (S) fed from the original roll (24) is intermittently conveyed integrally with the material sheet (S) while being overlapped with the base sheet (11). For this reason, the material sheet (S) is mounted on the presser rollers (201) and (202) (rotated with a weak rotational force by a driving source not shown) disposed before and after the entrance / exit of the punching section (P). The punched scrap (S ′) pulled out from the presser roller (202) which is pressed on the sheet (11) and located on the outlet side of the punching section (P) is wound around the scraper roll (22). It is supposed to be.

On the other hand, in the downstream side adjacent portion of the presser roller (202) located on the outlet side, the product (A) immediately after passing through the presser roller (202) floats from the base sheet (11) so as to curl. The product (A) discharged from the drive roller (21a) located downstream of the anti-levitation plate (18) is provided with a levitating prevention plate (18) that prevents the chute (19). It slides down and is taken out.
Japanese Patent Publication No. 6-32920

  However, in the above conventional one, when the operation of intermittently punching the product (A) from the material sheet (S) is repeated, as shown in FIG. 10, the punched portion (P) in the punching section (P) H) The stop position of the product (A part) and the lowering position of the cutting die (1) are slightly shifted in the width direction of the material sheet (S), and the amount of shift gradually increases. Good product is generated. And when the magnitude | size of the said deviation expanded to the level which can be visually confirmed, there existed a problem that a considerable amount of inferior goods had already arisen.

The above problem will be further described in detail.
In the above conventional one, for example, when the driving roller (21a) for driving the base sheet (11) is horizontal but the driven roller (21b) is not horizontal, the base sheet (11 ) Slightly shifts in the width direction, and the shift amount gradually increases. Then, the material sheet (S) conveyed in a state of being overlapped with the base sheet (11) is also shifted in the width direction together with the base sheet (11).
As a result, as shown in FIG. 10, the punched section (H) in the punching section (P) (the part that becomes the product (A)) is in the width direction with respect to the lowered position of the punching die (1). It will shift. And since this deviation | shift amount expands very slowly, when this deviation | shift amount expands to such an extent that it can visually confirm, a considerable amount of inferior goods have already generate | occur | produced.

The present invention has been made in view of such points.
`` The material sheet (S) in which the punched parts are formed at a predetermined pitch in the longitudinal direction is sequentially sent to the punching section (P) in a state of being superimposed on the base sheet (11),
In the punching apparatus that punches the punched section that has reached the punching section (P) with a punching die (1) pressed against the base sheet (11) from above the punched part ''. The problem is to accurately punch the product (A) from the material sheet (S) even if the punched section is displaced in the width direction of the material sheet (S) in the punching section (P). And

[Invention of Claim 1]
The technical means of the present invention for solving the above problems are as follows:
`` A mark sensor that detects a reference mark on the material sheet (S) at the punching section (P) or upstream thereof;
Displacement distance calculating means (60) for calculating a displacement distance in which the reference mark detected by the mark sensor is shifted in the width direction of the material sheet (S) from a preset reference position;
When the punched portion corresponding to the reference mark detected by the mark sensor reaches the punching station (P), the punching die (1) is shifted in the direction of shifting by the calculated displacement distance. And a punching position correcting means (61) to be moved ”.
Here, the fiducial mark may be a design of the product printed on the punched portion, and is referred to as a “dragonfly” printed separately from the design to determine a printing position or the like. Or a side of the material sheet (S) or a corner portion (in the case of sheet cutting).

According to the above technical means, when the reference mark corresponding to the punched portion to be punched in the punching section (P) is detected by the mark sensor, the reference mark is moved from the reference position by the output of the mark sensor. The distance displaced in the width direction of the material sheet (S), that is, the displacement distance is calculated by the displacement distance calculating means (60).
Then, the punching position correcting means (61) is arranged in the direction in which the punching die (1) is displaced when the punched part corresponding to the reference mark detected by the mark sensor reaches the punching section (P). Is moved by the displacement distance. Thus, even when the blank sheet (S) is displaced in the width direction due to the continuation of the punching operation, the punching die (1) accurately matches the punched portion.

[Invention of Claim 2]
In the invention of claim 1,
Assuming that the mark sensor is a camera that captures the reference mark, the displacement distance is calculated by determining the distance between the reference mark image captured by the camera and the virtual reference image. can do.

[Invention of claim 3]
In claim 1 or 2,
In `` the base sheet (11) is an endless belt whose surface is charged with static electricity '', since the material sheet (S) is adsorbed and held on the endless belt-like base sheet (11) by electrostatic force, There is less concern that the material sheet (S) slips in the conveyance direction with respect to the base sheet (11). Accordingly, even the thin material sheet (S) is reliably conveyed to the punching section (P) by the base sheet (11).

[Invention of Claim 4]
In claims 1 to 3,
In `` the product (A) punched by the punching die (1) is provided with a pressing rotating belt or a pressing roller that conveys the downstream side while pressing the base sheet (11) '', the punching die ( Even if the product (A) punched in 1) is a thin sheet that easily curls, it is reliably conveyed downstream in a state of being pressed between the base sheet (11) and the pressing roller or rotating belt. The

[Invention of Claim 5]
In claims 1 to 4,
“A die height adjusting eccentric mechanism for adjusting the distance between the punching die (1) and the base sheet (11) is provided between the output end of the output shaft for punching drive and the punching die (1). In the case of `` equipped '', near one dead center of the eccentric mechanism, specifically, near the dead point where the linear movement amount of the punching die (1) that becomes the output with respect to the input rotation amount becomes the minimum. If the die height is adjusted, the die height can be finely adjusted.

Since the present invention has the above configuration, the present invention has the following specific effects.
Since the position of the punching die (1) moves following the punched part that is displaced in the width direction of the material sheet (S), even if the material sheet (S) is displaced in the width direction by continuing the punching operation The punching die (1) exactly matches the punched part.

  In the invention of claim 3, since there is little fear that the material sheet (S) is attracted and held by the electrostatic force to the base sheet (11) and slips, the thin base sheet (S) is surely secured by the base sheet (11). To the punching section (P).

  In the invention of claim 4, the punched product (A) is reliably conveyed to the downstream side in a state of being pressed between the base sheet (11) and the pressing roller or the rotating belt.

  According to the invention of claim 5, the die height is near one dead point of the eccentric mechanism, specifically, near the dead point where the linear movement amount of the punching die (1) that is an output becomes the minimum with respect to the input rotation amount. If the adjustment is performed, the die height can be finely adjusted.

Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.
[overall structure]
As shown in FIG. 1, the punching device according to the present embodiment drives the machine body (K), a lift plate (35) that moves up and down above the machine body (K), and the lift plate (35). A punching drive source (B) and an endless belt-like base sheet (11) that travels between the upper and lower sides of the machine body (K) and the lifting plate (35) are provided.

  In the punching device shown in FIG. 1, the base sheet (11) is an endless belt made of rubber, plus chips, etc., and the base sheet (11) is placed on the upper surface of the bed (10) provided on the upper surface of the machine body (K). The base sheet (11) is wound in a loop between a driving roller (21a) and a driven roller (21b) provided on both sides of the machine body (K). The base sheet (11) between the rollers is pushed upward by the tension rollers (23a) (23a) disposed near both ends of the bed (10).

  In particular, in this embodiment, the arrangement positions of the tension rollers (23a) (23a) and the driving rollers (21a) so as to have a constant gap between the forward path side and the return path side of the base sheet (11). The intermediate plate (14) supported so as to be movable up and down in the vicinity of the bed (10) on the upper surface of the machine body (K) is placed above the bed (10). It is interposed between the forward path side and the return side of the seat (11).

  As shown in FIG. 4, the intermediate plate (14) is supported by lifting shafts (16) and (16) penetrating the upper surface plate (15) of the airframe (K), and the lifting shafts (16) and (16) are It is always biased upward by a spring (161) interposed between the intermediate plate (14) and the upper surface plate (15). The highest position of the intermediate plate (14) is set to a position where the base sheet (11) is slightly lifted. Therefore, there is usually a slight gap between the intermediate plate (14) and the return-side base sheet (11), and the punching die (1) Presses down the forward-side base sheet (11), and the intermediate plate (14) is pressed against the return-side base sheet (11), whereby the return-side base sheet (11) is brought into contact with the upper surface of the bed (10). Pressure contacted.

  In this embodiment, press rollers (201) and (202) are pressed against the upper surface of the base sheet (11) extending between the drive roller (21a) and the driven roller (21b) shown in FIG. The presser rollers (201) and (202) are configured to freely rotate together. The material sheet (S) is inserted between the presser rollers (201) and (202) and the base sheet (11), and the product (A) (A) from the material sheet (S) in the punching section (P). The punched waste (S ') after the punch is punched is wound up by the scrap removal roll (22).

  In this case, the material sheet (S) and the base sheet (11) travel synchronously as described above, and the transfer provided between the presser roller (202) on the downstream side and the scrap removing roll (22). The amount absorbing portion (23) absorbs a shift between the continuous winding by the scrap removing roll (22) and the intermittent transfer in the punching section (P). Specifically, the lifting rolls (231) and (231) are positioned between the fixed rolls (230) and (230) that support the punching scraps (S ′) from below and press the punching scraps (S ′) from above with their own weight. ) To absorb the above deviation. With this configuration, when the feed of the material sheet (S) to the punching section (P) is stopped during the continuous rotation of the scrap removing roll (22), that is, the driving roller (21a) and the driven roller (21b) When the travel of the base sheet (11) is stopped and the press rollers (201) (202) are stopped, the scrap (S) of the transfer amount absorbing portion (23) is removed by the continuously rotating waste removal roll (22). As') is wound up, the elevating rolls (231) and (231) are raised accordingly. On the other hand, when the feeding of the material sheet (S) to the punching section (P) is resumed, the waste scrap (S ') is faster than the winding speed of the scrap removal roll (22), and the transport amount absorbing portion (23) The lifting rolls (231) and (231) are lowered to absorb the talmi of the drawn residue (S ') that is supplied to the portion and generated at the transfer amount absorbing portion (23) at this time. Incidentally, the movement amount absorbing portion (25) located in the downstream side adjacent portion of the original fabric roll (24) performs the same function as the fixed roll (230) (230) and the lifting roll (231) (231). Fixed rolls (250) (250) and elevating rolls (251) (251) are provided, and thereby, there is a transfer deviation between continuous feed by the raw roll (24) and intermittent feed in the punching section (P). To absorb.

  Traces (d) and (d) generated when the cutting edge (100) of the punching die (1) bites into the base sheet (11) when the product (A) is punched from the material sheet (S) (see FIG. 3). ) Is crushed by the lowering pressure of the punching die (1) acting through the intermediate plate (14) when it returns to the lower side of the intermediate plate (14), thereby improving the durability of the base sheet (11). A drop is prevented.

[Punching drive source]
As shown in FIGS. 1 and 4, the dovetails (37) and (37) on the bottom surface of the central recess (36) formed on the top surface of the elevating plate (35) holding the tool post (12) are slidable. Rotating shafts (52) and (52) are supported on the fitted bearing blocks (38) and (38), and the sub-shaft (53) fitted and fixed to the rotating shafts (52) and (52) in an eccentric state. ) (53), lower end bosses (540) and (540) of connecting rods (54) and (54) are rotatably fitted. In addition, worm wheels (55) and (55) are separately attached to the rotary shafts (52) and (52), and the worm wheels (55) and (55) are engaged with the worms (56) and (56). The blade height is adjusted by a blade height adjusting handle (57). Then, when the blade height adjusting handle (57) is rotated, the worm (56) (56) and the worm wheel (55) (55) meshing therewith are rotated, and thereby the lower end of the connecting rod (54) (54) The countershafts (53) and (53) rotate relative to the bosses (540) and (540), and the elevating plate (35) moves up and down together with the tool post (12). As a result, the die height can be adjusted as the distance between the die (1) and the base sheet (11). In particular, when the height of the die (1) can be adjusted near the bottom dead center of the countershaft (53) (53), the amount of rotation (input) of the blade height adjustment handle (57) near the bottom dead center Since the raising / lowering amount (output) of the die (1) with respect to is small, the height of the die (1) can be finely adjusted.
In the present embodiment, the set of connecting rods (54) (54), countershafts (53) (53), rotating shafts (52) (52), and bearing blocks (38) (38) have already been described. It corresponds to the eccentric mechanism for adjusting the die height.

  Further, in the present embodiment, when a downward pressing force is applied from the connecting rod (54) (54) to the sub shaft (53) (53), the sub shaft (53) (53) rotates in the reverse direction. It has a configuration like this. Specifically, the countershaft (53) appearing on the left side of FIG. 4 is configured to rotate clockwise while the countershaft (53) appearing on the right side is rotated counterclockwise. In this way, when a downward pressing force is applied from the connecting rod (54) (54) to the countershaft (53) (53), the handle shaft (58) for the blade height adjusting handle (57) (worm (56 ) (56) is attached to the worm (56) (56), a force for compressing the handle shaft (59) in the axial direction is applied. Accordingly, the handle shaft (58) is less likely to be damaged than when an axial tensile force is applied to the handle shaft (58). This is because the shaft body generally has higher strength against compression than tensile strength.

Further, punching countershafts (64) and (64) are inserted into the upper end bosses (541) and (541) of the connecting rods (54) and (54), and the punching countershafts (64) and (64) are inserted. Is rotated by a motor (67) through rotary shafts (65) and (65) and speed reducers (66) and (66).
Therefore, the driving force of the motor (67) is reduced gear (66) (66) → rotating shaft (65) (65) → punching auxiliary shaft (64) (64) → connecting rod (54) (54) → auxiliary shaft (53) (53) → Rotating shaft (52) (52) → Bearing block (38) (38) → Elevating plate (35) (35) The product (A) (A) is punched up and down with the table (12).

[About the mounting part of the punching die (1)]
As shown in FIGS. 1 and 4, the lower surface of the elevating plate (35) moving up and down along the guide posts (34) and (34) slides in the width direction of the material sheet (S) and the base sheet (11). A flexible tool post (12) is mounted.
Specifically, as shown in FIG. 5, a tool post (12) is loaded in a sliding groove (351) formed on the lower surface of the elevating plate (35), and the upper end of the tool post (12). Engagement flanges (121) and (121) projecting on both sides engage from above with ribs (350) and (350) projecting opposite to the lower edge of the sliding groove (351), whereby the tool post (12) Can slide in the width direction of the material sheet (S) and the base sheet (11) with respect to the elevating plate (35).

  On the other hand, a servo motor (45) is disposed on the side end surface of the elevating plate (35), specifically on the side end surface corresponding to one end in the width direction of the material sheet (S) (see FIG. 4). The feed screw (46) rotated by the servo motor (45) is threaded through a nut (47) fixed to the tool post (12), and the leading end of the screw is a large diameter of the tool post (12). It is loosely inserted into the hole (120). Accordingly, when the feed screw (46) is rotated by the servo motor (45), the tool post (12) is integrally formed with the slide groove (351) with the nut (47) screwed to the feed screw (46). Slide inside. Thereby, the punching position by the punching die (1) can be adjusted in the width direction of the material sheet (S).

[About camera (5)]
A camera (5) such as a CCD camera as a mark sensor is fixed to an end of the raising / lowering plate (35) on the feeding side of the material sheet (S) (see FIGS. 1 and 6).
This camera (5) is a "register mark" that is a reference mark printed in the vicinity of the area (punched part) that becomes the product (A) (A) on which the design and characters are printed, and is a material sheet (S) Take a picture of what is printed in the vicinity of one of the sides.

  As shown in FIG. 7, the output of the camera (5) is applied to the displacement distance calculation means (60) incorporated in the control device, and the output of the displacement distance calculation means (60) Applied to the punching position correcting means (61) of the apparatus. As shown in FIG. 8, the displacement distance calculating means (60) is a material sheet (S0) from a reference image (T0) in which the image (T1) of the registration mark photographed by the camera (5) is set in the photographing region (F). ) Is shifted in the width direction ΔL (the registration mark is set so as to match the dimension shifted in the width direction of the material sheet (S) from the reference position), and the punching position is calculated. The correction means (61) moves the tool post (12) in the shift direction by the deviation dimension ΔL. In the present embodiment, the feed screw (46) screwed into the nut (47) on the end surface of the tool post (12), the servo motor (45) for driving the feed screw, and the servo motor (45) are A motor control device (not shown) that rotates the phase angle corresponding to the deviation dimension ΔL corresponds to the punching position correcting means (61) described above. Then, the motor control device takes into account that the cutting die (1) is separated from the arrangement position of the camera (5) in the conveying direction of the material sheet (S), and the register mark photographed by the camera (5). Control to move the tool post (12) in the width direction of the material sheet (S) by the above-mentioned deviation dimension ΔL when the punched part corresponding to 1 reaches just below the punching die (1) of the punching station (P). To do. Therefore, even if the material sheet (S) gradually shifts in the width direction due to the continuation of the punching operation, the servo motor (45) and the feed screw (46) operate so as to absorb the deviation dimension ΔL. The punching die (1) can be punched with high accuracy without deviating from the punched portion, thereby reducing the amount of defective products and improving the yield.

[Pressing Rotating Belt (4)]
On the downstream side of the punching section (P), a pressing rotary belt (4) for pressing the blanked sheet (S) onto the base sheet (11) is disposed, and the pressing rotary belt (4 ) Is composed of a drive roller (41) and a driven roller (42) that rotate synchronously with the drive roller (21a) of the base sheet (11), and an endless belt (43) wound around them. In this product, since the product (A) punched by the punching die (1) is conveyed downstream in a state of being clamped by the base sheet (11) and the pressing rotary belt (4), the product (A) is Even if it is a thin sheet that easily curls, it is prevented from being curled on the front and back by being pinched by the base sheet (11) and the pressing rotary belt (4).

[Charging device (3)]
In the vicinity of the driven roller (21b) for the base sheet (11), there is provided a charging device (3) for electrostatically charging the outer surface of the base sheet (11), on the surface of the base sheet (11). The material sheet (S) is attracted and held by electrostatic force.
Thereby, even if it is a thin raw material sheet (S), there is less concern that it will slip in the conveying direction with respect to the base sheet (11), thereby further improving the punching accuracy.
If the base sheet (11) is made of a chargeable material, the base sheet (11) is charged when the dregs (S ') is peeled off from the base sheet (11). The sheet (S) can be adsorbed and held on the base sheet (11) by electrostatic force, but if the material sheet (S) needs to be adsorbed and held by a large electrostatic force, the above charging device (3) should be provided. Is effective.

[Meander adjustment mechanism (7)]
In the punching device according to the present embodiment, a meandering adjustment mechanism (7) is provided for adjusting the amount by which the travel position of the base sheet (11) is gradually biased in the width direction (hereinafter referred to as “meandering amount”). It has been.
Specifically, as shown in FIG. 1 and FIG. 2, the meandering adjustment mechanism (7) is a tension that presses the travel area on the return path side of the base sheet (11) upward in the vicinity of the driven roller (21b). A levelness adjusting screw (71) for adjusting the levelness of the roller (23a) is provided. As shown in FIG. 2, one end of the tension roller (23a) is supported by a bearing (230) so as to be swingable up and down. Therefore, when the height of one end of the tension roller (23a) is changed by adjusting the screwing degree of the horizontality adjusting screw (71) with respect to the fixing portion (72), the horizontal force of the tension roller (23a) is accordingly changed. As a result, the pressing force acting on the base sheet (11) from the tension roller (23a) becomes non-uniform in the sheet width direction. Therefore, the meandering amount of the base sheet (11) during traveling can be adjusted. Accordingly, the formation position of the biting traces (d), (d) (see FIG. 3) of the punching die (1) with respect to the base sheet (11) can be gradually moved in the width direction of the base sheet (11). The traces (d) and (d) are prevented from concentrating at the same position in the width direction of the sheet (11), thereby preventing the durability of the base sheet (11) from being lowered.

[Other]
1. Instead of the pressing rotation belt (4), a single roller or a plurality of rollers arranged in parallel in the conveying direction may be used.
2. The mark sensor is not limited to the camera (5), and various optical sensors can be employed.
3. In the above embodiment, the registration mark as a reference mark is photographed with the camera (5), but the design (characters) and characters to be the product (A) (A) printed on the material sheet (S) are displayed on the camera ( The image may be taken in step 5), and the symbol or character may be used as a reference mark. Further, the side portion of the material sheet (S) or the corner portion of the material sheet photographed by the camera (5) in the case of sheet cutting may be adopted as the reference mark.

The front view of the punching apparatus which concerns on embodiment of this invention Explanation of meandering amount adjustment mechanism The figure which shows the trace (d) which is formed in the base sheet (11) at the time of punching The side view of the punching apparatus which concerns on embodiment of this invention Explanatory drawing of the mounting part of the tool post (12) The top view of a part omission of the punching apparatus which concerns on embodiment of this invention Block diagram showing the relationship between the camera (5), distance calculation means (60) and punching position correction means (61) Diagram explaining the relationship between the registration mark image (T1) and the reference image (T0) taken with the camera (5) Illustration of conventional example Illustration of conventional example

Explanation of symbols

(1) ・ ・ ・ Punching die
(11) ... Stand sheet
(60) ... Displacement distance calculation means
(61) ... Punching position correction means
(A) ・ ・ ・ Product
(P) ・ ・ ・ Punching section
(S) ・ ・ ・ Material sheet

Claims (5)

The material sheet (S) in which the punched parts are formed at a predetermined pitch in the longitudinal direction is sequentially fed to the punching section (P) in a state of being stacked on the base sheet (11), and
In the punching device for punching the punched section that has reached the punching section (P) with a punching die (1) pressed against the base sheet (11) from above the punched portion,
A mark sensor for detecting a reference mark on the material sheet (S) at the punching section (P) or upstream thereof; and
Displacement distance calculating means (60) for calculating a displacement distance in which the reference mark detected by the mark sensor is shifted in the width direction of the material sheet (S) from a preset reference position;
When the punched portion corresponding to the reference mark detected by the mark sensor reaches the punching station (P), the punching die (1) is shifted in the direction of shifting by the calculated displacement distance. A punching device comprising punching position correction means (61) for movement. In the punching device according to claim 1,
The punching device, wherein the mark sensor is a camera that photographs the reference mark. In the punching device according to claim 1 or 2,
The base sheet (11) is a punching device, the surface of which is an endless belt charged with static electricity. In the punching device according to claims 1 to 3,
A punching device provided with a pressing rotary belt or a pressing roller for conveying the product (A) punched by the punching die (1) to the downstream side while pressing the product (A) on the base sheet (11). In the punching device according to claims 1 to 4,
An eccentric mechanism for adjusting the die height for adjusting the distance between the punching die (1) and the base sheet (11) is provided between the output end of the output shaft for punching drive and the punching die (1). A punching device.

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