JPH1085875A - Improved canning machine redrawing mechanism. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the selectivity of redrawing pressure and the cycle time by engaging a cam driven element of a core with a cam, reciprocating the cam with the shifting of the cam and acting a restraining force to the core with an electromagnetic means fitted to the front surface of a housing. SOLUTION: When a bull gear is driven, the cylindrical cam 164 is rotated, and since one pare of driven elements 182, 184 are brought into contact with the front surface and the rear surface of the cylindrical cam 164, the movable core 160 is reciprocated on a shaft member 162. The front surface of the cylindrical cam 164 pushes the movable core 160 toward the front surface of the housing 154 and the redrawing sleeve 152 is brought into the contact with and engaged with a cupped shape body. An electric coil 190 is arranged in a channel 189 of a plate, and magnetic field is formed between dowel cycles at the time of stopping the working, and a cylindrical cam is pushed to the restrained position to grip a can, and a drawing and an ironing are started to form can body part. In such a way, the cycle time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a can-making machine, and more particularly to a re-drawing device for a can-making machine. The improved redraw device includes a mechanically reciprocated redraw sleeve that captures the can prior to drawing and ironing. An electromagnetic device generates a holding force during drawing and ironing.

[0002]

2. Description of the Related Art A conventional can-making machine is disclosed in H. U.S. Pat. No. 3,696,659 to Maytag is disclosed and an improvement of the ram assembly over a can ram assembly is described in US Pat. M. US Patent No. 4,934 to Grims et al.
No. 169. Both of these patents are owned by Adolf Kuas Co. Has been transferred to An example of a conventional re-drawing device is given to Elpidof Paramonov, Standan Inc. Has been transferred to

The assignees of the present invention are US Pat. No. 5,454,252 “Canning machine with flexible redrawing sleeve”, US Pat. No. 5,454,253 “Redrawing mechanism of canning machine” and He is also the assignee of U.S. Pat. No. 5,454,254, "Can making machine with air actuator redraw mechanism."

[0004] Can machines produce elongated can bodies from shallow metal cups or can shells. The can shell is about 0.229
細 0.305 mm (0.009-0.012 inches), and the elongated can body has a thickness of 0.114 mm (0.004 inches).
5 inches). In conventional canning machines, the ram can be reciprocated linearly with sufficient speed to form 180-220 cans per minute.
Mounted movably. About 0.0127mm-0.0
It goes without saying that a misalignment as small as 254 mm (0.0005 to 0.0010 inches) will result in a defective can. In connection with the reciprocation of the ram, the redraw sleeve is reciprocally supported by the redraw assembly. The redraw sleeve engages the can shell before the ram contacts the can shell and exerts a restraining force on the can shell as it is processed by the redraw die. Redrawing extends the sidewalls of the can shell, reducing the wall thickness and the overall diameter of the can shell. The redrawing operation is followed by a few ironing stations in which the can shell is further stretched and thinned to form a unitary can body. Finally, the can making machine can further comprise a hemispherical shaping station that forms the enclosed bottom of the can body into the desired structural shape.

[0005] The redraw assembly operates at the same reciprocating speed as the ram assembly. It has been conventional practice to create a mechanical connection between the main crankshaft of the can machine and the ram and redraw assemblies. In order to minimize the possibility of misalignment, conventional canning machines have a redraw sleeve carriage supported on a track path parallel to the ram assembly. Of course, a very large mass can reciprocate within the re-draw carriage assembly, and this mass can affect the misalignment problem described above. Another approach to such a mechanical coupling device is to apply electromagnetic technology to the redraw actuator of the can machine. Examples of such applications are described in U.S. Pat. Nos. 5,221,977, 4,912,343, 5,187,398 and 52.
Nos. 71259 and 5257523, the entire contents of which are incorporated herein by reference.

[0006]

Nevertheless, there is a continuing desire in the canning industry to increase the operating speed of canning machines, for example, up to 400 per minute per individual canning machine. It is a goal in the can industry to achieve a can making speed in excess of pieces, and in some cases even more than 500 pieces.

[0007]

SUMMARY OF THE INVENTION In accordance with the present invention, an improved redraw device for a can machine includes redraw housing means adapted to be fixedly mounted to the can machine and through which. The ram reciprocates. The redraw housing means has a front side near the tool pack of the can machine and a rear side opposite the front side. The front includes electromagnetic means mounted therein. A cam support means is mounted for rotation within the redraw housing means. The cam support means is a cylinder having an inner surface and an outer surface. The outer surface includes gear means coupled to the actuating means, the gear means transmitting rotational movement to the cam support means in the redraw housing means. The inner surface of the cam support means includes an inner cam projecting radially inward from the cylinder surface. A core means (central body) is mounted within the ram support means and is capable of reciprocating within the redraw housing means. The core means has a front surface, and an iron core member is supported on the front surface,
A redraw sleeve can be attached to the core member. The movable core means includes cam follower means (cam follower means) interlocked with the inner cam means. As the cam support means rotates within the housing, the cam causes the movable core means to reciprocate.

The inner cam means includes a front cam surface and a rear cam surface, which interact with a cam follower supported by a movable core. Through the first part of one complete revolution of the cam support means, the front face of the cam presses the movable core towards the front face of the redraw housing. At the closest position when the movable core approaches the front of the redrawing housing, a dwell cycle (operation stop cycle) starts, and the redrawing sleeve contacts and engages with the cup-shaped body to be subjected to drawing and ironing processing. The cam is shaped like During the dwell cycle, the electromagnetic means is energized to press the movable cam into a restraining position, where a restraining force of up to 5000 pounds is applied by the redraw sleeve. This hold down grips the can between the redraw sleeve and the tool pack. Next, the ram moves toward the cup-shaped body, and the drawing and the ironing process start, whereby the can body is formed. During the dwell cycle, the cam support means continues to rotate within the housing. At the end of the dwell cycle, rotation of the cam support means initiates retraction of the movable core by the cam and the redraw sleeve attached thereto from the tool pack. At the furthest position of travel from the tool pack, the movable core enters another dwell cycle. During retraction of the redraw sleeve, any dwell cycle of the moving core, and subsequent approach of the moving core toward the tool pack, the molded can is removed from the tool pack and a new cup shape is drawn and drawn. Installed for

It is an object of the present invention to provide an improved redrawing device for use in a canning machine.

[0010] It is an object of the present invention to provide a conventional air spring air cylinder device typically used in conventional redraw devices.
It is also the elimination of the redraw carriage and hydrodynamic bearing.

Again, it is an object of the present invention to provide an improved redraw device which allows for increased reselection pressure selectivity and improved cycle time.

Yet another object of the present invention is to provide a proven structure for supporting and aligning the redraw sleeve while minimizing the reciprocating mass associated with the redraw operation. It is.

It is another object of the present invention to provide a redrawing apparatus which can be mounted on an existing can making machine.

The above and other features and advantages of the present invention will become more fully apparent upon consideration of the detailed description of the invention, taken in conjunction with the accompanying drawings.

In order to fully appreciate the concepts of the present invention, it is important to understand certain basic features of a typical can machine. In FIG.
Indicated by The can machine 10 includes a frame or housing structure 12 with a motor 1
4 are mounted, and the motor drives a plurality of pulley wheels 16 with a belt 17. The pulley wheel 16
Fixedly mounted on one of a pair of laterally extending, axially aligned crankshafts 18 having crank arms 20. The crankshaft 18 is rotatably supported by bearings mounted on opposite sides of the frame 12. The crank arm 20 is connected to a crank pin 22 extending through the bearing of a main connecting rod 24 which terminates at its other end with two parallel laterally spaced arms. The crosshead member 26 is adapted to engage with the peripheral surface of the crosshead member 26.
Is a portion of a linear motion assembly, generally designated 30.
The pivot point of this assembly is shown at 32. The crosshead member 26 is circumferentially engaged by the connecting rod 24 by the end of the carriage connecting rod 34. The other end of the carriage connecting rod 34 is swingably connected to a ram assembly 40, and a ram or punch, generally indicated by reference numeral 42, is mounted on the ram assembly.

The ram or linear motion assembly 40 includes an upper rocking lever 68 and a lower rocking lever 70 that withstand lateral thrust (thrust), both of which have an inner end bifurcated. And straddles the crosshead member 26. The upper swing lever 68 is swingably connected to the crosshead member 26 as indicated by reference numeral 72, and the lower swing lever 70 is swingably connected to the crosshead member 26 as indicated by reference numeral 74. I have. The upper end of the upper pivoting lever 68 is swingably connected to the fixed swinging center point 76 of the frame member 12, and the lower end of the lower swinging lever 70 is the fixed swinging center point of the frame member 12. 78 to be swingably rotatable.

A redraw sleeve support assembly, generally designated 50, is located near a tool pack housing 80. The redraw sleeve 52 moves along an axis parallel to the ram 42 and can move longitudinally or in the X-axis independently of the ram. A tool pack 80 mounted on the front of the can machine, i.e., on the left side as shown in FIG. 1, surrounds a series of squeezing and ironing dies (not shown) through which shallow cups 82 are formed. Such a workpiece is processed by a ram that is interlocked with the redrawing assembly 50. The cup 82 is squeezed and ironed into a can body 84, and a suitable transfer device 86 transports the can body 84 from the can machine 10 to other processing equipment. Redrawing is the most important function in the can making process. The redraw assembly 50 is located in front of the ram assembly 30 and next to the die housing assembly 80. The re-drawing assembly 50 performs the re-drawing operation and constitutes the alignment structure of the re-drawing sleeve 52. In general, the redraw sleeve 52 aligns the metal cup during the redraw operation and exerts the proper pressure on the cup to hold the metal cup against the redraw die surface of the tool pack 80.

Turning to FIGS. 2-6, an improved redraw device 150 of the present invention supports a redraw sleeve 152 in a support housing, generally designated 154. The redraw sleeve reciprocates in the support housing along the X axis. This reciprocation is relative to the front of the ram.
Independent movement of the redraw sleeve assembly occurs in relation to and in a time relationship to the movement of the ram assembly. The redrawing device 150 is fixedly mounted on the frame of the can machine near the tool pack.

The redraw sleeve support assembly 150 includes a housing 154 having a front surface 156 and a rear surface 158. It should be understood that the "front" and "front" indicate portions of the assembly 150 near the tool pack 80. The moving core 160 is supported by a plurality of shaft members indicated by reference numeral 162 (FIG. 3). Preferably, there are four such shaft members 162 extending through the housing 154 and supported by the front and rear surfaces 156 and 158 of the housing. The housing 154 supports a re-draw cam 164 (FIG. 3) and forms part of the assembly 150. Re-drawing cam 16
4 includes a cylindrical member surrounding the movable core 160. The cylindrical cam 164 is supported at a position indicated by reference numeral 166 by a plurality of bearings. The outer diameter surface 168 of the cylindrical cam 164 is 170
Includes toothed surfaces as indicated by. Symbol 172
The driving means shown in FIG. 4 is mechanically connected to a bull gear (main driving gear) 174 (FIG. 4), and the bull gear is mechanically connected to gear teeth 170 on the outer diameter surface of the cylindrical cam 160. ing. The rotation of the bull gear by the driving means rotates the cylindrical cam in the housing 154.
The cylindrical cam includes a cam means 176 (FIG. 4), which defines a cam front 178 and a cam rear 180. The cam 176 and its front 178 and rear 180
Are specifically described below.

The movable core 160 has reference numerals 182 and 184.
It has a pair of followers shown in FIG. Cylindrical cam 1
As the 64 rotates within the housing 154, the cam followers in contact with the front and rear surfaces of the cam cause the movable core 160 to reciprocate on the shaft member 162.

A steel core member 188 (FIGS. 3 and 4) is mounted on the front surface 186 of the movable member 160. Redraw sleeve 152 is mounted in bore 146 formed by steel core 188 by methods well known in the art. From this, it can be recognized that a ram (not shown) penetrates the hole 146 and the re-drawing sleeve 152.

The front surface 186 of the housing 154 includes a housing plate 188 fixedly supported within the housing near its front surface 186. The plate includes a formed channel 189 in which a woven electrical coil 190 (made of the woven conductive material of FIGS. 3 and 4) is located. The coil 190 is electrically connected to a suitable power supply schematically shown by reference numeral 192 so that the coil 190 can be selectively energized to form a magnetic field.

The cam means 176 has a front face 178 and a rear face 1
80, and these surfaces form a cam shape as shown in FIGS. 360 cam means
When rotated, the core 160 reciprocates from the rearmost position through the drawing at the forefront position and the pressing time during the ironing process, and thereafter returns to the rearmost position. This forward movement is performed during a cam rotation of 0 ° to 80 °. The cam surface 178 is in contact with the cam follower 182 and drives the core forward to engage the cup preform. Throughout the 35 ° dwell region (dwell period), the dwell period, the electromagnetic suppression force is energized as described in detail below. Rear surface of cam follower 180
Forms a gap between the rear cam follower 184 and
When the electromagnetic force acts on the central core to hold the redraw sleeve in its foremost position, there is no interference with the rear surface of the cam. The drawing and the ironing are completed during the first dwell period. As the cam means 164 continues to rotate through the next moving portion, ie, about 115 ° to 350 °, the core member is disengaged from the tool pack and moves rearward. The cam surface 180 is in contact with the cam follower 184 and drives the core backward toward a second optional dwell time. An optional dwell period or second dwell can be provided at about 350-360 °. This second dwell coincides with when the core is at the tip of the tool pack.

A control means 194 (FIG. 3) incorporating means for energizing and deactivating the electromagnetic force generated by the coil 190 is connected to a suitable power supply 192. This control means 194 ensures that the effect of the holding force occurs when the cup 82 is positioned for drawing and ironing. Holding force is the first in cam movement
It must be maintained through the drawing and ironing processes that occur between the dwell areas. Further, the control means 194
Is electrically connected to the drive motor 172 to adjust the motor speed of the cam to change the time required for the movable housing of the re-draw sleeve to complete one cycle. For example, at a speed of about 400 strokes / min, the redraw sleeve must engage, hold down, and release the cup at a rate of 400 cups / min.

By adjusting the cam timing, one cycle of the redraw sleeve is linked to the stroke of the ram. The cam could be deformed to perform two cycles of the redraw sleeve each time the cam cylinder rotates. Further, the optional second dwell time can be omitted.

The present invention has been described in an illustrative manner. It should be understood that the predicates used are intended as words of explanation rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, within the scope of the claims, the present invention can be realized other than as specifically described.

[Brief description of the drawings]

FIG. 1 is a somewhat schematic elevation view of a prior art canning machine.

FIG. 2 is a perspective view of the re-drawing device of the present invention.

FIG. 3 is a cross-sectional view of the re-drawing device of the present invention shown in a front position.

FIG. 4 is a cross-sectional view of the re-drawing device of the present invention.

FIG. 5 is a sectional view of a rotary cam mechanism of the re-drawing device of the present invention.

FIG. 6 is a graph plotting the amount of movement of the redraw device over a complete movement cycle.

[Explanation of symbols]

 Reference Signs List 10 canning machine 12 frame 14 motor 30 linear motion assembly 40 ram assembly 50 redrawing sleeve support assembly 84 can body 150 redrawing device 152 redrawing sleeve 154 housing 160 movable core 164 cylindrical cam 178 cam front surface 180 cam rear surface 182 , 184 follower 190 electric coil 192 power supply 194 controller

Continuation of front page (72) Inventor Bezad B. Saroche P. Inglewood, Colorado, United States. Oh. Box 1687, Rags Dale Machinery, Inc. Notice

Claims (20)

[Claims] 1. A redrawing housing means fixedly mounted on a can-making machine, having a front face and a rear face, said front face having means susceptible to magnetic action, and said redrawing means. Core means mounted reciprocally within the housing means and having a cam follower; cam means mounted on the redraw housing means and operatively engaged with the cam follower Wherein said cam means causes the movement of said cam means to reciprocate said core means, and is mounted on a front surface of said re-drawing housing means, so as to exert a pressing force on said core means. Re-drawing device for a can-making machine, comprising: 2. The re-drawing device according to claim 1, wherein the core means comprises means for receiving a front re-drawing sleeve. 3. The re-drawing device according to claim 1, wherein the cam means is rotatably mounted inside the re-drawing housing means. 4. The re-drawing device according to claim 1, wherein the cam means is rotatably mounted inside the re-drawing housing means and includes a cam cylinder having an outer surface and an inner surface. A redrawing device having a cam member from which the inner surface projects radially inward therefrom. 5. The re-drawing device according to claim 4, wherein the cam member has a first cam surface and a second cam surface. 6. The re-drawing device according to claim 5, wherein the cam followers of the core means are a front first cam follower and a rear second cam follower, and the front first cam follower. Is engaged with the first surface of the cam means, and the rear second cam follower is engaged with the second cam surface of the cam means. 7. The re-drawing device according to claim 6, wherein the rotation of the cam means causes the core means to reciprocate from a front position near the tool pack to a rear position which is a tip of the tool pack. Aperture device. 8. The re-drawing device according to claim 7, wherein the cam means defines a first dwell cycle, and in this dwell cycle, the second cam surface is separated from the second cam follower. This ensures that when the core means engages with the electromagnetic means, the second follower contacts the second cam surface so that the forward movement of the core means is not impeded. Re-drawing device. 9. A re-drawing device according to claim 5, wherein the first cam surface contacts the first cam follower at the beginning of the cam shape defined by the full rotation of the cam cylinder. apparatus. 10. The re-drawing device according to claim 9, wherein full rotation of the cam cylinder represents a 360 ° cycle and the first cam follower engages for about 80 °. . 11. The re-drawing device according to claim 9, wherein the second portion of the cam contacts the second cam follower at a subsequent portion of the cam shape, and the subsequent portion is approximately 115 ° to 150 °. A re-drawing device extending over it. 12. The re-drawing device according to claim 9, wherein the second surface of the cam is separated from the second cam follower during the dwell cycle, and the electromagnetic force acts on the core member during the dwell cycle. Re-drawing device. 13. The re-drawing device according to claim 1, wherein the cam means is rotatably mounted inside the core means, includes a cam cylinder outer surface, and the re-draw housing means is A re-drawing device including actuating means mechanically coupled to the outer surface of the cam cylinder for rotating the cam cylinder within the housing. 14. In combination with a can-making machine, the re-drawing device is adapted to be fixedly mounted on the can-making machine and has a front surface and a rear surface, the front surface affecting magnetic action. Redraw housing means having means susceptible to retraction, core means mounted reciprocally within the redraw housing means and including a cam follower, mounted on the redraw housing means, A cam means operatively engaged with the cam follower, whereby the movement of the cam means reciprocates the core means; and A combination mounted with electromagnetic means selectively actuated to exert a holding force on said core means. 15. The combination according to claim 14, wherein the core means includes means for receiving a front redraw sleeve. 16. The combination according to claim 14, wherein the cam means is rotatably mounted within the redraw housing means. 17. The combination according to claim 14, wherein the cam means is rotatably mounted within the redraw housing means, and comprises a cam cylinder having an outer surface and an inner surface. A combination having a cam member having an inner surface projecting radially inward therefrom. 18. The combination according to claim 17, wherein the cam member has a first cam surface and a second cam surface. 19. The combination according to claim 18, wherein the cam followers of the core means are a front first cam follower and a rear second cam follower, and the front first cam follower is a cam follower. A combination engaging the first surface of the means and the second cam follower engaging the second cam surface of the cam means. 20. The combination according to claim 14, wherein the cam means is rotatably mounted within the core means, has a cam cylinder outer surface, and wherein the re-throttle housing means has a cam cylinder outer surface. A combination having actuating means mechanically coupled and adapted to rotate a cam cylinder within a housing.