US20070289354A1 - Method And Apparatus For Feeding Fasteners To A Processing Device - Google Patents
Method And Apparatus For Feeding Fasteners To A Processing Device Download PDFInfo
- Publication number
- US20070289354A1 US20070289354A1 US11/835,496 US83549607A US2007289354A1 US 20070289354 A1 US20070289354 A1 US 20070289354A1 US 83549607 A US83549607 A US 83549607A US 2007289354 A1 US2007289354 A1 US 2007289354A1
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- Prior art keywords
- fasteners
- duct
- loading
- conveying
- magazine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
- B23P19/004—Feeding the articles from hoppers to machines or dispensers
- B23P19/005—Feeding the articles from hoppers to machines or dispensers by using flowing gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/10—Riveting machines
- B21J15/30—Particular elements, e.g. supports; Suspension equipment specially adapted for portable riveters
- B21J15/32—Devices for inserting or holding rivets in position with or without feeding arrangements
Definitions
- the invention concerns a method for feeding fasteners having at least two parallel boundary surfaces to a processing device, wherein the fasteners are placed in readiness, lined up in the same orientation, by a feeder and are conveyed through a conveying duct to a loading device arranged on the processing device.
- the invention further concerns an apparatus for feeding fasteners to a processing device having a feeder for placing the fasteners in readiness in a uniform orientation, a loading device arranged on the processing device, a conveying duct connecting the feeder to the loading device, and a magazine associated with the loading device for accommodating a plurality of fasteners lined up one behind the other in the same orientation.
- a method is known from EP 0,922,538 B1 wherein a fastener in the form of a self-piercing rivet with a head and a shank recessed from the head is fed by a feeder through a conveying duct to a loading device arranged on the self-piercing riveting tool.
- the conveying duct has a T-shaped cross-section that corresponds essentially to the projected area of the self-piercing rivet.
- the self-piercing rivets are fed to the conveying duct with their longitudinal axes oriented perpendicular to the direction of conveyance and are individually transported through the conveying duct to the loading device by means of air.
- the delivered self-piercing rivet is stopped, and is held by means of movable positioning segments and an arresting element in a suitable starting position for processing.
- This known method and the devices for this purpose known from the aforementioned document have been proven in use.
- the time required for individual feeding of the fasteners has proven a disadvantage for fast operating cycles and relatively long application-specific conveying distances.
- the shape of the rivet is unfavorable, increased wear on the walls of the conveying duct can occur.
- the small parts are arranged facing in the same direction, with the shanks forward, in a column in a cylindrical supply tube.
- the supply tube has at its top an opening for supplying parts and a compressed air inlet, and at its bottom has an outlet associated with a member for intermittent release of the parts.
- the cylindrical tube is arranged in the shape of a ring in multiple windings in the interior of a rigid container and forms a magazine in which a large number of parts are stocked.
- the inner diameter of the tube is larger than the greatest diameter of the parts by a certain ratio so that an air stream which drives the parts toward the outlet can flow along the tube toward the outlet past the parts to the end of the outlet.
- the object of the invention is to specify a method of the initially mentioned type that permits fast feed times, is characterized by modest energy requirements, and contributes to low wear of the conveying duct. It is a further object of the invention to create an apparatus suitable for carrying out the method.
- the fasteners are conveyed in individual conveying steps which are separated from one another in time, wherein at each conveying step a column of multiple fasteners in the same orientation, with their parallel boundary surfaces resting on one another, is conveyed by the feeder to the loading device on the processing device through the introduction of air into the conveying duct.
- the inventive method permits fast conveying times between the feeder and the loading device, since multiple fasteners are conveyed in each conveying step.
- the conveying speed can be varied over a wide range by the choice of the time intervals between conveying steps and the number of fasteners per conveying step.
- the inventive method further permits comparatively low use of energy in the form of compressed air, since the quantity of air and pressure required for a conveying step encompassing multiple fasteners is not significantly greater than for a conveying step for conveying a single fastener, yet the number of conveying steps is many times smaller than for individual conveying.
- the inventive method contributes to a substantial reduction in wear of the conveying duct and also to problem-free conveying of fasteners with an unfavorable diameter-to-length ratio.
- This can be attributed to the fact that the individual fasteners in the column support one another with their parallel boundary surfaces, thus stabilizing their position.
- the fasteners are self-piercing rivets, which have a sharp cutting edge at one end, the fasteners can be conveyed using the inventive method with the cutting edge first without this leading to appreciably greater wear on the walls of the conveying duct.
- Another proposal of the invention provides that the column of fasteners fed to the loading device is accommodated in a magazine of the loading device, and the fasteners are removed individually from the magazine by the loading device and fed to the processing device as a function of the processing cycle.
- the fasteners are preferably conveyed through the conveying duct to the magazine of the loading device as a function of the processing cycle or the fill level in the magazine.
- a sensor or a counter detects when the quantity of fasteners in the magazine falls below a minimum level, thereby triggering a control process which brings about the conveyance of a new column of fasteners to the magazine.
- An apparatus suitable for carrying out the method according to the invention comprises a feeder that places fasteners in readiness in a consistent orientation, a conveying duct that connects the feeder to a loading device arranged on a processing device, and a magazine associated with the loading device for accommodating a column of multiple fasteners delivered through the conveying duct in the same orientation, with their parallel boundary surfaces resting on one another, wherein the loading device has, adjoining an output end of the magazine, a loading duct that extends perpendicular to the longitudinal axis of the magazine and terminates in a working duct of the processing device, and wherein the loading duct has associated with it a conveying mechanism which conveys individual fasteners emerging from the magazine into the working duct of the processing device one at a time.
- the inventive apparatus is characterized by a simple construction and reliable operation.
- the loading device design with a loading duct arranged at right angles to the longitudinal axis of the magazine yields a compact construction of the loading device and an advantageous arrangement of the magazine and conveying duct with little interfering contour in the vicinity of the working area of the processing device.
- favorable three-dimensional shapes for the loading device with its magazine result when the self-piercing rivets are fed to the magazine with the cutting edge first.
- the self-piercing rivets can then be transported perpendicular to their axis of rotation from the magazine to the working duct of the riveting tool, which ensures a reliably functioning feed of the individual self-piercing rivets to the riveting tool.
- the conveying mechanism of the loading device has a loading slide that can be moved back and forth in the loading duct with the aid of a pneumatically driven piston.
- the loading slide's path of motion extends over only part of the length of the loading duct, and a pneumatic conveying mechanism activated by the loading slide is provided to convey the fasteners on the section of loading duct not traversed by the loading slide.
- This embodiment permits a short stroke for the loading slide, and thus a compact construction of the loading device. Moreover, it prevents collisions between the loading slide and tools of the processing device extending into the working duct.
- a pneumatic working cylinder with a double-acting piston whose piston rod is connected to the loading slide is provided for moving the loading slide.
- the piston, the piston rod, and the loading slide are traversed by a passage that communicates with a working chamber of the pneumatic working cylinder when the loading slide is in a position advanced toward the working duct.
- a valve needle is arranged in the working cylinder; in a first position of the piston, the needle projects into the piston end of the passage, thus closing it, and in a second position of the piston, the needle withdraws from the passage, causing the passage to be connected to the working chamber.
- FIG. 1 shows a riveting tool with a device for feeding self-piercing rivets
- FIG. 2 shows a section through a conveying duct with a column of self-piercing rivets resting upon one another;
- FIG. 3 shows a loading device for transporting individual self-piercing rivets from a magazine into the working duct of a riveting tool.
- FIG. 1 shows a processing device shown for example as a riveting tool 1 intended to process self-piercing rivets.
- Self-piercing rivets are used to join components made of sheet metal. They are pressed into the superposed metal sheets from one side with great force by a die, with the metal sheets being supported on an anvil that constitutes a support.
- the riveting tool 1 has a C-shaped yoke 2 for this purpose, which carries at one end an anvil 3 and at the opposite end a housing 4 in which are arranged a die that can be moved against the anvil 3 and a device for driving the die.
- a loading device 5 with a magazine 6 which is supplied through a conveying duct 7 with self-piercing rivets placed in readiness by a feeder 8 .
- the conveying duct 7 consists of a resilient plastic tube, and in some applications must bridge a gap of several meters between the feeder 8 and the riveting tool 1 .
- FIG. 2 shows a longitudinal section through a portion of the conveying duct 7 .
- the wall 9 of the conveying duct 7 has an annular cross-section and encloses a hollow space that, depending on the course of the conveying duct 7 , is cylindrical in part and in part forms a segment of a torus.
- Located in the conveying duct 7 in FIG. 2 is a column of individual self-piercing rivets 10 .
- the self-piercing rivets 10 have a rotationally symmetric shape, composed essentially of a cylindrical shank section 11 and a head section 12 in the shape of a truncated cone.
- the axial ends of the self-piercing rivet 10 are delimited by parallel circular areas 13 , 14 .
- the circular area 13 forms, together with the surface contour of the shank section 11 , a cutting edge 15 .
- the greatest outer diameter of the self-piercing rivet 10 is located at the head section 12 and is somewhat smaller than the inside diameter of the conveying duct 7 so that the self-piercing rivets 10 can slide through the conveying duct 7 without jamming and without much resistance.
- the self-piercing rivets 10 have an unfavorable aspect ratio, since their diameter is greater than their axial thickness. If the self-piercing rivets 10 were to fail to maintain their coaxial position within the conveying duct 7 shown in FIG. 2 and turn about, they could jam in the conveying duct 7 and prevent further transport to the loading device 5 . This is avoided by the invention in that a column is formed of a number of self-piercing rivets 10 for transport through the conveying duct 7 , with the circular areas 13 , 14 of each of the individual self-piercing rivets 10 resting one against the other.
- the back end of the column is then subjected to compressed air introduced into the conveying duct 7 , which drives the column through the conveying duct 7 to the magazine 6 designed in the manner of an end section of the conveying duct 7 .
- the self-piercing rivets 10 in the column are pressed against one another and prevented from assuming an orientation that would impede their sliding through the conveying duct. Consequently, the self-piercing rivets 10 glide along the wall 9 of the conveying duct 7 , guided by the edge of their head sections 12 , without their cutting edges 15 being able to touch and damage the wall 9 appreciably.
- the magazine 6 From the conveying duct 7 , the self-piercing rivets 10 arrive at the magazine 6 one column at a time.
- the magazine 6 has an S-shaped magazine duct 16 , which joins the conveying duct 7 and has essentially the same diameter as the conveying duct 7 .
- the magazine 6 is rigidly connected to the loading device 5 and the magazine duct 16 terminates at a right angle in a loading duct 17 of the loading device 5 .
- the loading duct 17 has a rectangular cross-section, with a width corresponding to the diameter of the shank section 11 of the self-piercing rivets 10 .
- the top edge 18 of the loading duct 17 is extended outward at an angle on both sides to match the truncated cone shape of the head section 12 of the self-piercing rivets 10 so that the head section 12 can be accommodated and held therein.
- the loading duct 17 extends from the termination of the magazine duct 16 to a working duct 19 , which branches off from the floor of the loading duct 17 at a right angle. Opposite the working duct 19 , a bore 20 terminates in the loading duct 17 ; a die 21 that can move into the working duct 19 is located in said bore 20 .
- a detent pawl 22 protrudes into the loading duct 17 from above, which pawl is rotatably mounted and supported by a spring 23 in such a way that it can be pivoted out of the loading duct 17 against the force of the spring 23 .
- the detent pawl 22 has a detent surface 24 facing the bore 20 , and on the opposite side has a ramp surface 25 that is inclined to the longitudinal axis of the loading duct and that recedes from the floor of the loading duct 17 when viewed in the direction of the termination of the magazine duct 16 .
- a loading slide 26 Located next to the termination of the magazine duct 16 in the loading duct 17 is a loading slide 26 , which can move into the loading duct 17 .
- a pneumatic working cylinder 27 with a double-acting piston 28 and a piston rod 29 is provided to move the loading slide 26 .
- the piston rod 29 is rigidly connected to the loading slide 26 .
- a passage 30 extends through the piston 28 , the piston rod 29 and the loading slide 26 .
- a valve needle 31 which is affixed to the cylinder block, projects into the piston end of the passage 30 , closing the passage 30 .
- Connecting bores that are not shown in the drawing connect working chambers 32 , 33 , which are located on both sides of the piston 28 , with a pneumatic valve device for controlling the movement of the loading slide 26 .
- FIG. 3 shows the loading device 5 in an operating position in which the loading slide 26 has returned to its starting position after a loading process, wherein the loaded self-piercing rivet 10 a is still located in front of the termination of the working duct 19 and is held in this position by the side walls of the loading duct 17 and the detent pawl 22 .
- the die 21 is moved downward by operating the riveting tool 1 , in which process the side walls of the loading duct 17 move apart to some degree so that the thicker head section of the self-piercing rivet 10 a can pass through the narrower region of the loading duct 17 .
- the die 21 then forces the self-piercing rivet 10 a through the loading duct 19 , which elastically expands, thus guiding the self-piercing rivet 10 a in a frictional manner to the workpieces resting on the anvil and pressing it into them. Then the die 21 returns to the starting position shown so that the next self-piercing rivet 10 b can be loaded.
- the self-piercing rivet 10 b is already located in the back end of the loading duct 17 in front of the loading slide 26 .
- the self-piercing rivet 10 b has arrived in this position as a result of gravity and compressed air introduced into the magazine duct 16 , which forces the column of self-piercing rivets 10 toward the loading duct 17 even in the event of an overhead arrangement of the riveting tool 1 .
- compressed air is applied to the working chamber 32 of the working cylinder 27 and the working chamber 33 is connected to the atmosphere.
- the compressed air supply to the piston 28 is reversed, moving the piston and the loading slide 26 back into the initial position as a result of the compressed air introduced into the chamber 33 .
- the column of self-piercing rivets 10 moves in the direction of the loading duct 17 until the foremost self-piercing rivet reaches the position of the self-piercing rivet 10 b , where its head section is supported against the upper edge of the loading duct.
- Reliable conveyance of the self-piercing rivets into the working duct of the riveting tool is achieved through the design and method of operation of the loading device 5 described above. Rotation of the rivets is not necessary.
- the combination of mechanical conveyance with the aid of the loading slide and the subsequent pneumatic conveyance of the self-piercing rivet into its working position permits a compact design of the loading device.
- the interaction of mechanical and pneumatic conveyance is controlled in a simple manner as a function of travel, and thus requires no additional control.
- the described design of the apparatus additionally has the advantage that self-piercing rivets of different lengths can be fed without the need to make changes in the device.
- the conveyance of columns of rivets into the magazine arranged on the loading device permits high working speed for the riveting tool and makes for low consumption of compressed air.
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Abstract
A method and apparatus for feeding fasteners with at least two parallel boundary surfaces to a processing device includes lining up the fasteners in the same orientation by a feeder. The fasteners move through a conveying duct to a loading device arranged on a processing device. Individual conveying steps are separated from one another in time. At each conveying step a column of multiple fasteners in the same orientation, with their parallel boundary surfaces resting on one another, is conveyed by the feeder to the loading device by introducing air into the conveying duct. The loading device has, adjoining a magazine output end, a loading duct extending perpendicular to a magazine longitudinal axis, terminating in a processing device working duct. The loading duct has a conveying mechanism which conveys individual fasteners emerging from the magazine into the working duct one at a time.
Description
- This application is a continuation of International Application No. PCT/EP2006/050729, filed Feb. 7, 2006, which claims the benefit of German Patent Application No. 10 2005 006 795.6, filed Feb. 14, 2005. The disclosures of the above applications are incorporated herein by reference.
- The invention concerns a method for feeding fasteners having at least two parallel boundary surfaces to a processing device, wherein the fasteners are placed in readiness, lined up in the same orientation, by a feeder and are conveyed through a conveying duct to a loading device arranged on the processing device. The invention further concerns an apparatus for feeding fasteners to a processing device having a feeder for placing the fasteners in readiness in a uniform orientation, a loading device arranged on the processing device, a conveying duct connecting the feeder to the loading device, and a magazine associated with the loading device for accommodating a plurality of fasteners lined up one behind the other in the same orientation.
- A method is known from EP 0,922,538 B1 wherein a fastener in the form of a self-piercing rivet with a head and a shank recessed from the head is fed by a feeder through a conveying duct to a loading device arranged on the self-piercing riveting tool. The conveying duct has a T-shaped cross-section that corresponds essentially to the projected area of the self-piercing rivet. In this context, the self-piercing rivets are fed to the conveying duct with their longitudinal axes oriented perpendicular to the direction of conveyance and are individually transported through the conveying duct to the loading device by means of air. In the loading device, the delivered self-piercing rivet is stopped, and is held by means of movable positioning segments and an arresting element in a suitable starting position for processing. This known method and the devices for this purpose known from the aforementioned document have been proven in use. However, the time required for individual feeding of the fasteners has proven a disadvantage for fast operating cycles and relatively long application-specific conveying distances. Moreover, if the shape of the rivet is unfavorable, increased wear on the walls of the conveying duct can occur.
- In a method known from EP 0,511,093 B1 for conditioning and delivery of small, cylindrical parts, such as screws or rivets, the small parts are arranged facing in the same direction, with the shanks forward, in a column in a cylindrical supply tube. The supply tube has at its top an opening for supplying parts and a compressed air inlet, and at its bottom has an outlet associated with a member for intermittent release of the parts. The cylindrical tube is arranged in the shape of a ring in multiple windings in the interior of a rigid container and forms a magazine in which a large number of parts are stocked. The inner diameter of the tube is larger than the greatest diameter of the parts by a certain ratio so that an air stream which drives the parts toward the outlet can flow along the tube toward the outlet past the parts to the end of the outlet. This known method has the disadvantage that it requires a relatively large installation space in the vicinity of the processing device. Moreover, the energy requirements for transporting the parts are relatively great, since the entire column of many parts must be moved each time one part is dispensed. Short-term changeover between parts of different lengths is likewise not easily possible.
- The object of the invention is to specify a method of the initially mentioned type that permits fast feed times, is characterized by modest energy requirements, and contributes to low wear of the conveying duct. It is a further object of the invention to create an apparatus suitable for carrying out the method.
- This object is attained in accordance with the invention by the method and apparatus claims set forth herein. Advantageous embodiments of the method and apparatus are specified in the dependent claims referring back to each of these claims. In the inventive method, the fasteners are conveyed in individual conveying steps which are separated from one another in time, wherein at each conveying step a column of multiple fasteners in the same orientation, with their parallel boundary surfaces resting on one another, is conveyed by the feeder to the loading device on the processing device through the introduction of air into the conveying duct.
- The inventive method permits fast conveying times between the feeder and the loading device, since multiple fasteners are conveyed in each conveying step. The conveying speed can be varied over a wide range by the choice of the time intervals between conveying steps and the number of fasteners per conveying step. The inventive method further permits comparatively low use of energy in the form of compressed air, since the quantity of air and pressure required for a conveying step encompassing multiple fasteners is not significantly greater than for a conveying step for conveying a single fastener, yet the number of conveying steps is many times smaller than for individual conveying.
- Surprisingly, it has additionally become apparent that the inventive method contributes to a substantial reduction in wear of the conveying duct and also to problem-free conveying of fasteners with an unfavorable diameter-to-length ratio. This can be attributed to the fact that the individual fasteners in the column support one another with their parallel boundary surfaces, thus stabilizing their position. Even when the fasteners are self-piercing rivets, which have a sharp cutting edge at one end, the fasteners can be conveyed using the inventive method with the cutting edge first without this leading to appreciably greater wear on the walls of the conveying duct.
- Another proposal of the invention provides that the column of fasteners fed to the loading device is accommodated in a magazine of the loading device, and the fasteners are removed individually from the magazine by the loading device and fed to the processing device as a function of the processing cycle. The fasteners are preferably conveyed through the conveying duct to the magazine of the loading device as a function of the processing cycle or the fill level in the magazine. A sensor or a counter detects when the quantity of fasteners in the magazine falls below a minimum level, thereby triggering a control process which brings about the conveyance of a new column of fasteners to the magazine.
- An apparatus suitable for carrying out the method according to the invention comprises a feeder that places fasteners in readiness in a consistent orientation, a conveying duct that connects the feeder to a loading device arranged on a processing device, and a magazine associated with the loading device for accommodating a column of multiple fasteners delivered through the conveying duct in the same orientation, with their parallel boundary surfaces resting on one another, wherein the loading device has, adjoining an output end of the magazine, a loading duct that extends perpendicular to the longitudinal axis of the magazine and terminates in a working duct of the processing device, and wherein the loading duct has associated with it a conveying mechanism which conveys individual fasteners emerging from the magazine into the working duct of the processing device one at a time.
- The inventive apparatus is characterized by a simple construction and reliable operation. The loading device design with a loading duct arranged at right angles to the longitudinal axis of the magazine yields a compact construction of the loading device and an advantageous arrangement of the magazine and conveying duct with little interfering contour in the vicinity of the working area of the processing device. Especially in the feeding of self-piercing rivets to a riveting tool, favorable three-dimensional shapes for the loading device with its magazine result when the self-piercing rivets are fed to the magazine with the cutting edge first. In the loading device, the self-piercing rivets can then be transported perpendicular to their axis of rotation from the magazine to the working duct of the riveting tool, which ensures a reliably functioning feed of the individual self-piercing rivets to the riveting tool.
- According to another proposal of the invention, the conveying mechanism of the loading device has a loading slide that can be moved back and forth in the loading duct with the aid of a pneumatically driven piston. According to another proposal of the invention, the loading slide's path of motion extends over only part of the length of the loading duct, and a pneumatic conveying mechanism activated by the loading slide is provided to convey the fasteners on the section of loading duct not traversed by the loading slide. This embodiment permits a short stroke for the loading slide, and thus a compact construction of the loading device. Moreover, it prevents collisions between the loading slide and tools of the processing device extending into the working duct.
- In an advantageous embodiment, a pneumatic working cylinder with a double-acting piston whose piston rod is connected to the loading slide is provided for moving the loading slide. In order to form the pneumatic feed mechanism, the piston, the piston rod, and the loading slide are traversed by a passage that communicates with a working chamber of the pneumatic working cylinder when the loading slide is in a position advanced toward the working duct. In order to control the pneumatic conveying mechanism, a valve needle is arranged in the working cylinder; in a first position of the piston, the needle projects into the piston end of the passage, thus closing it, and in a second position of the piston, the needle withdraws from the passage, causing the passage to be connected to the working chamber.
- The invention is described below on the basis of an example embodiment which is shown in the drawings.
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FIG. 1 shows a riveting tool with a device for feeding self-piercing rivets; -
FIG. 2 shows a section through a conveying duct with a column of self-piercing rivets resting upon one another; and -
FIG. 3 shows a loading device for transporting individual self-piercing rivets from a magazine into the working duct of a riveting tool. -
FIG. 1 shows a processing device shown for example as a riveting tool 1 intended to process self-piercing rivets. Self-piercing rivets are used to join components made of sheet metal. They are pressed into the superposed metal sheets from one side with great force by a die, with the metal sheets being supported on an anvil that constitutes a support. The riveting tool 1 has a C-shaped yoke 2 for this purpose, which carries at one end ananvil 3 and at the opposite end ahousing 4 in which are arranged a die that can be moved against theanvil 3 and a device for driving the die. For feeding the self-piercing rivets, there is located on the riveting tool 1 aloading device 5 with amagazine 6, which is supplied through aconveying duct 7 with self-piercing rivets placed in readiness by afeeder 8. Theconveying duct 7 consists of a resilient plastic tube, and in some applications must bridge a gap of several meters between thefeeder 8 and the riveting tool 1. -
FIG. 2 shows a longitudinal section through a portion of theconveying duct 7. Thewall 9 of theconveying duct 7 has an annular cross-section and encloses a hollow space that, depending on the course of the conveyingduct 7, is cylindrical in part and in part forms a segment of a torus. Located in the conveyingduct 7 inFIG. 2 is a column of individual self-piercing rivets 10. The self-piercing rivets 10 have a rotationally symmetric shape, composed essentially of acylindrical shank section 11 and ahead section 12 in the shape of a truncated cone. The axial ends of the self-piercingrivet 10 are delimited by parallelcircular areas circular area 13 forms, together with the surface contour of theshank section 11, acutting edge 15. The greatest outer diameter of the self-piercingrivet 10 is located at thehead section 12 and is somewhat smaller than the inside diameter of the conveyingduct 7 so that the self-piercingrivets 10 can slide through the conveyingduct 7 without jamming and without much resistance. - As can be seen in
FIG. 2 , the self-piercingrivets 10 have an unfavorable aspect ratio, since their diameter is greater than their axial thickness. If the self-piercingrivets 10 were to fail to maintain their coaxial position within the conveyingduct 7 shown inFIG. 2 and turn about, they could jam in the conveyingduct 7 and prevent further transport to theloading device 5. This is avoided by the invention in that a column is formed of a number of self-piercingrivets 10 for transport through the conveyingduct 7, with thecircular areas rivets 10 resting one against the other. The back end of the column is then subjected to compressed air introduced into the conveyingduct 7, which drives the column through the conveyingduct 7 to themagazine 6 designed in the manner of an end section of the conveyingduct 7. As a result of the propulsive force acting on the back end of the column and the compressive force acting on the front end of the column—generated by the resistance of the air in front of the column in the conveying duct to being forced through a throttling port at the magazine end of the conveying duct—the self-piercingrivets 10 in the column are pressed against one another and prevented from assuming an orientation that would impede their sliding through the conveying duct. Consequently, the self-piercingrivets 10 glide along thewall 9 of the conveyingduct 7, guided by the edge of theirhead sections 12, without theircutting edges 15 being able to touch and damage thewall 9 appreciably. - From the conveying
duct 7, the self-piercingrivets 10 arrive at themagazine 6 one column at a time. As is visible inFIG. 3 , themagazine 6 has an S-shapedmagazine duct 16, which joins the conveyingduct 7 and has essentially the same diameter as the conveyingduct 7. Themagazine 6 is rigidly connected to theloading device 5 and themagazine duct 16 terminates at a right angle in aloading duct 17 of theloading device 5. Unlike the round cross-section of themagazine duct 16, theloading duct 17 has a rectangular cross-section, with a width corresponding to the diameter of theshank section 11 of the self-piercingrivets 10. Thetop edge 18 of theloading duct 17 is extended outward at an angle on both sides to match the truncated cone shape of thehead section 12 of the self-piercingrivets 10 so that thehead section 12 can be accommodated and held therein. Theloading duct 17 extends from the termination of themagazine duct 16 to a workingduct 19, which branches off from the floor of theloading duct 17 at a right angle. Opposite the workingduct 19, abore 20 terminates in theloading duct 17; a die 21 that can move into the workingduct 19 is located in said bore 20. Immediately next to thebore 20, adetent pawl 22 protrudes into theloading duct 17 from above, which pawl is rotatably mounted and supported by aspring 23 in such a way that it can be pivoted out of theloading duct 17 against the force of thespring 23. Thedetent pawl 22 has adetent surface 24 facing thebore 20, and on the opposite side has aramp surface 25 that is inclined to the longitudinal axis of the loading duct and that recedes from the floor of theloading duct 17 when viewed in the direction of the termination of themagazine duct 16. - Located next to the termination of the
magazine duct 16 in theloading duct 17 is aloading slide 26, which can move into theloading duct 17. A pneumatic workingcylinder 27 with a double-actingpiston 28 and apiston rod 29 is provided to move theloading slide 26. Thepiston rod 29 is rigidly connected to theloading slide 26. Apassage 30 extends through thepiston 28, thepiston rod 29 and theloading slide 26. Avalve needle 31, which is affixed to the cylinder block, projects into the piston end of thepassage 30, closing thepassage 30. Connecting bores that are not shown in the drawing connect workingchambers 32, 33, which are located on both sides of thepiston 28, with a pneumatic valve device for controlling the movement of theloading slide 26. -
FIG. 3 shows theloading device 5 in an operating position in which theloading slide 26 has returned to its starting position after a loading process, wherein the loaded self-piercingrivet 10 a is still located in front of the termination of the workingduct 19 and is held in this position by the side walls of theloading duct 17 and thedetent pawl 22. In order to set the self-piercingrivet 10 a, thedie 21 is moved downward by operating the riveting tool 1, in which process the side walls of theloading duct 17 move apart to some degree so that the thicker head section of the self-piercingrivet 10 a can pass through the narrower region of theloading duct 17. The die 21 then forces the self-piercingrivet 10 a through theloading duct 19, which elastically expands, thus guiding the self-piercingrivet 10 a in a frictional manner to the workpieces resting on the anvil and pressing it into them. Then the die 21 returns to the starting position shown so that the next self-piercingrivet 10 b can be loaded. - As the drawing shows, the self-piercing
rivet 10 b is already located in the back end of theloading duct 17 in front of theloading slide 26. The self-piercingrivet 10 b has arrived in this position as a result of gravity and compressed air introduced into themagazine duct 16, which forces the column of self-piercingrivets 10 toward theloading duct 17 even in the event of an overhead arrangement of the riveting tool 1. In order to bring the self-piercingrivet 10 b into the working position between the die 21 and the workingduct 19, compressed air is applied to the workingchamber 32 of the workingcylinder 27 and the working chamber 33 is connected to the atmosphere. This causes thepiston 28 to move theloading slide 26 into theloading duct 17, pushing the self-piercingrivet 10 b ahead of it and simultaneously closing the outlet of themagazine duct 16. Before thepiston 28 reaches its end position on the floor of the working chamber 33, thevalve needle 31 emerges from thepassage 30, with the result that the compressed air supplied to the workingchamber 32 flows through thepassage 30 and exits at the end face of theloading slide 26. The emerging stream of air strikes the self-piercingrivet 10 b and pushes it under thedetent pawl 22, which deflects upward, and into the end position under thedie 21, where it is held in place by thedetent surface 24 of thedetent pawl 22 which has sprung back to its initial position. As soon as thepiston 28, and with it theloading slide 26, have reached their advanced end position, the compressed air supply to thepiston 28 is reversed, moving the piston and theloading slide 26 back into the initial position as a result of the compressed air introduced into the chamber 33. Once theloading slide 26 has exposed the outlet of themagazine duct 16, the column of self-piercingrivets 10 moves in the direction of theloading duct 17 until the foremost self-piercing rivet reaches the position of the self-piercingrivet 10 b, where its head section is supported against the upper edge of the loading duct. - Reliable conveyance of the self-piercing rivets into the working duct of the riveting tool is achieved through the design and method of operation of the
loading device 5 described above. Rotation of the rivets is not necessary. The combination of mechanical conveyance with the aid of the loading slide and the subsequent pneumatic conveyance of the self-piercing rivet into its working position permits a compact design of the loading device. The interaction of mechanical and pneumatic conveyance is controlled in a simple manner as a function of travel, and thus requires no additional control. The described design of the apparatus additionally has the advantage that self-piercing rivets of different lengths can be fed without the need to make changes in the device. The conveyance of columns of rivets into the magazine arranged on the loading device permits high working speed for the riveting tool and makes for low consumption of compressed air.
Claims (23)
1. An apparatus for feeding fasteners having at least two parallel boundary surfaces to a processing device, comprising:
a feeder operable to place a plurality of fasteners in a consistent orientation;
a conveying duct connected to the feeder;
a magazine connected to the conveying duct operable to receive the fasteners from the conveying duct;
a throttling port located at a magazine end of the conveying duct; and
a column defining a portion of the fasteners formed for transport through the conveying duct, with proximate ones of the boundary surfaces of the individual fasteners resting one against the other, a back end of the column being subjected to compressed fluid introduced into the conveying duct defining a propulsive force operable to drive the column through the conveying duct to the magazine, and a compressive force acting on a front end of the column generated by resistance from a volume of fluid in front of the column in the conveying duct being forced through the throttling port, a combination of the propulsive force and the compressive force acting to press the fasteners in the column against one another to prevent the fasteners from assuming an orientation that would impede their sliding through the conveying duct.
2. The apparatus of claim 1 , further comprising a loading device operable to receive the fasteners and position the fasteners for installation.
3. The apparatus of claim 2 , further comprising a loading duct of the loading device adjoining an output end of the magazine, the loading duct extending perpendicular to a longitudinal axis of the magazine and terminating in a working duct of the processing device.
4. The apparatus of claim 3 , further comprising a conveying mechanism of the loading duct operable to convey individual ones of the fasteners emerging from the magazine into the working duct of the processing device one at a time.
5. The apparatus of claim 4 , further comprising a piston operable to drive the conveying mechanism.
6. The apparatus of claim 4 , further comprising:
a working duct elastically expadable to receive individual ones of the fasteners from the conveying mechanism; and
a die oriented perpendicular to the loading duct and adapted to force the individual ones of the fasteners through the working duct into a workpiece.
7. The apparatus of claim 6 , further comprising a detent pawl operably biased by a biasing member to contact and temporarily hold individual ones of the fasteners for contact by the die.
8. The apparatus of claim 1 , wherein individual ones of the plurality of fasteners each have an unfavorable aspect ratio defining a diameter greater than an axial thickness.
9. An apparatus for feeding fasteners having at least two parallel boundary surfaces to a processing device, comprising:
a feeder operable to place the fasteners in a consistent orientation;
a conveying duct connecting the feeder to a loading device arranged on a processing device;
a magazine associated with the loading device accommodating a column of multiple fasteners delivered through the conveying duct in the same orientation, the fasteners having parallel boundary surfaces abutting one another;
a loading duct of the loading device adjoining an output end of the magazine, the loading duct extending perpendicular to a longitudinal axis of the magazine and terminating in a working duct of the processing device; and
a conveying mechanism of the loading duct operable to convey individual ones of the fasteners emerging from the magazine into the working duct of the processing device one at a time.
10. The apparatus of claim 9 , wherein the loading device includes a loading slide movable back and forth in the loading duct with the aid of a pneumatically driven piston.
11. The apparatus of claim 10 , comprising:
a loading slide path of motion extending over only a portion of a length of the loading duct; and
a pneumatic conveying mechanism activated by movement of the loading slide operable to convey the fasteners on a section of the loading duct not traversed by the loading slide.
12. The apparatus of claim 10 , comprising:
a pneumatic working cylinder having a double-acting piston and a piston rod connected to the loading slide; and
a passage in communication with a working chamber of the pneumatic working cylinder, the piston rod and the loading slide traversed lengthwise by the passage when the loading slide is in a position advanced toward the working duct.
13. The apparatus of claim 12 , further comprising a valve needle arranged in the working cylinder operable to control the pneumatic conveying mechanism, wherein in a first position of the piston, the valve needle is projected into the piston end of the passage, thus closing it, and wherein in a second position of the piston, the valve needle is withdrawn from the passage, causing the passage to be connected to the working chamber.
14. The apparatus of claim 13 , further comprising a sensor operable to detect when the quantity of fasteners in the magazine falls below a minimum level, the sensor further operable to trigger a control process operable to convey a next column of fasteners to the magazine.
15. The apparatus of claim 13 , further comprising a counter operable to detect when the quantity of fasteners in the magazine falls below a minimum level, the sensor further operable to trigger a control process operable to convey a next column of fasteners to the magazine.
16. The apparatus of claim 13 , further comprising:
each of the fasteners having a head section including a truncated cone shape; and
a top edge of the loading duct extending outward at an angle on opposite sides of the loading duct operable to match the truncated cone shape of the head section of the fasteners.
17. A method for feeding fasteners with at least two parallel boundary surfaces to a processing device, the method comprising:
placing the fasteners in readiness, lined up in a same orientation by a feeder;
connecting a conveying duct between the feeder to a loading device arranged on the processing device;
moving the fasteners in individual conveying steps which are separated from one another in time through the conveying duct;
grouping the fasteners during individual ones of the individual conveying steps as a column of multiple fasteners in the same orientation with the parallel boundary surfaces resting on one another using pressurized air introduced behind the column in the conveying duct; and
maintaining the individual fasteners of the column in contact with each other by introducing a fluid backpressure at a forward end of the column.
18. The method according to claim 17 , comprising feeding the column of fasteners to the loading device into a magazine of the loading device.
19. The method according to claim 18 , comprising:
individually removing the fasteners from the magazine by the loading device; and
feeding the fasteners to the processing device as a function of a processing cycle.
20. The method according to claim 19 , comprising conveying the fasteners through the conveying duct to the magazine of the loading device as a function of one of the processing cycle and a fill level in the magazine.
21. The method according to claim 18 , comprising accomplishing the conveyance of the individual fasteners from the magazine to the processing device partially mechanically and partially pneumatically.
22. The method according to claim 17 , comprising adjusting a quantity of fasteners per column to adapt to an operating speed of the processing device.
23. The method according to claim 17 , comprising adjusting a quantity of fasteners per a time interval between individual column conveying cycles to adapt to an operating speed of the processing device.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005006795A DE102005006795A1 (en) | 2005-02-14 | 2005-02-14 | Method and device for feeding connecting elements to a processing device |
DE102005006795.6 | 2005-02-14 | ||
PCT/EP2006/050729 WO2006084847A1 (en) | 2005-02-14 | 2006-02-07 | Method and device for feeding connecting elements to a manufacturing device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/050729 Continuation WO2006084847A1 (en) | 2005-02-14 | 2006-02-07 | Method and device for feeding connecting elements to a manufacturing device |
Publications (1)
Publication Number | Publication Date |
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US20070289354A1 true US20070289354A1 (en) | 2007-12-20 |
Family
ID=36091357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/835,496 Abandoned US20070289354A1 (en) | 2005-02-14 | 2007-08-08 | Method And Apparatus For Feeding Fasteners To A Processing Device |
Country Status (5)
Country | Link |
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US (1) | US20070289354A1 (en) |
EP (1) | EP1858659B1 (en) |
JP (1) | JP5070064B2 (en) |
DE (1) | DE102005006795A1 (en) |
WO (1) | WO2006084847A1 (en) |
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US20110289763A1 (en) * | 2005-08-31 | 2011-12-01 | Newfrey Llc | Method and device for supply of connecting elements to a processing apparatus |
US20130019457A1 (en) * | 2009-06-05 | 2013-01-24 | Newfrey Llc | Singulation for an apparatus for feeding a connecting element |
US20130047425A1 (en) * | 2010-04-22 | 2013-02-28 | Kabushiki Kaisha F.C.C. | Rivet setter |
US20130071209A1 (en) * | 2011-09-21 | 2013-03-21 | Alexander Schug | Method and apparatus for feeding joining elements |
CN107639200A (en) * | 2017-10-25 | 2018-01-30 | 苏州卓尹特机电科技有限公司 | One kind flies nail self-piercing riveting device |
CN109093055A (en) * | 2017-01-03 | 2018-12-28 | 东莞理工学院 | A kind of iron plate riveting column machine facilitating tabletting |
US11167340B2 (en) | 2017-12-05 | 2021-11-09 | Atlas Copco Ias Uk Limited | Nose arrangements for fastener setting machines, and related methods |
US11213879B2 (en) * | 2017-01-16 | 2022-01-04 | Bayerische Motoren Werke Aktiengesellschaft | Device and method for producing a component |
US11241729B2 (en) | 2017-12-05 | 2022-02-08 | Atlas Copco Ias Uk Limited | Fastener handling devices for fastener setting machines, and related methods |
US11660658B2 (en) | 2017-12-05 | 2023-05-30 | Atlas Copco Ias Uk Limited | Fastener magazines, and related supply systems and methods |
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DE102009040764B4 (en) | 2009-09-09 | 2017-08-24 | Böllhoff Verbindungstechnik GmbH | Magazine, loading station and processing device for fasteners and a method of feeding fasteners to the processing device and magazine |
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DE102013000799B4 (en) | 2013-01-17 | 2015-05-28 | Audi Ag | Device for feeding connecting elements to a processing device |
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KR102059681B1 (en) * | 2018-08-06 | 2019-12-26 | 미르텍 주식회사 | Apparatus for automatically supplying rivet |
CA3120649C (en) * | 2018-12-13 | 2023-06-20 | Howmet Aerospace Inc. | Rivet dispensing systems and methods of use thereof |
DE102019114421B3 (en) * | 2019-05-29 | 2020-07-09 | HELLA GmbH & Co. KGaA | Screwing device with protective device for use in a collaborative workplace |
CN110523909B (en) * | 2019-07-10 | 2021-02-05 | 南京航空航天大学 | Automatic nail feeding system and method based on robot vision |
DE102021120006B4 (en) * | 2021-08-02 | 2024-04-18 | Raimund Beck Nageltechnik Gmbh | Feeding device, arrangement and use of such an arrangement |
DE102023201098A1 (en) * | 2023-02-10 | 2024-08-14 | Arnold Umformtechnik Gmbh & Co. Kg | Device and method for feeding fasteners and arrangement |
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Cited By (16)
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US8973247B2 (en) * | 2005-08-31 | 2015-03-10 | Newfrey Llc | Method and device for supply of connecting elements to a processing apparatus |
US20110289763A1 (en) * | 2005-08-31 | 2011-12-01 | Newfrey Llc | Method and device for supply of connecting elements to a processing apparatus |
US20130019457A1 (en) * | 2009-06-05 | 2013-01-24 | Newfrey Llc | Singulation for an apparatus for feeding a connecting element |
US8898883B2 (en) * | 2009-06-05 | 2014-12-02 | Newfrey Llc | Singulation for an apparatus for feeding a connecting element |
US20130047425A1 (en) * | 2010-04-22 | 2013-02-28 | Kabushiki Kaisha F.C.C. | Rivet setter |
US9149864B2 (en) * | 2010-04-22 | 2015-10-06 | Kabushik Kaisha F.C.C. | Rivet setter |
US20130071209A1 (en) * | 2011-09-21 | 2013-03-21 | Alexander Schug | Method and apparatus for feeding joining elements |
US9610632B2 (en) * | 2011-09-21 | 2017-04-04 | Newfrey Llc | Method and apparatus for feeding joining elements |
CN109093055A (en) * | 2017-01-03 | 2018-12-28 | 东莞理工学院 | A kind of iron plate riveting column machine facilitating tabletting |
US11213879B2 (en) * | 2017-01-16 | 2022-01-04 | Bayerische Motoren Werke Aktiengesellschaft | Device and method for producing a component |
CN107639200A (en) * | 2017-10-25 | 2018-01-30 | 苏州卓尹特机电科技有限公司 | One kind flies nail self-piercing riveting device |
US11167340B2 (en) | 2017-12-05 | 2021-11-09 | Atlas Copco Ias Uk Limited | Nose arrangements for fastener setting machines, and related methods |
US11241729B2 (en) | 2017-12-05 | 2022-02-08 | Atlas Copco Ias Uk Limited | Fastener handling devices for fastener setting machines, and related methods |
US11660658B2 (en) | 2017-12-05 | 2023-05-30 | Atlas Copco Ias Uk Limited | Fastener magazines, and related supply systems and methods |
US11673183B2 (en) | 2017-12-05 | 2023-06-13 | Atlas Copco Ias Uk Limited | Fastener handling devices for fastener setting machines, and related methods |
US11919066B2 (en) | 2017-12-05 | 2024-03-05 | Atlas Copco Ias Uk Limited | Nose arrangements for fastener setting machines, and related methods |
Also Published As
Publication number | Publication date |
---|---|
EP1858659B1 (en) | 2012-09-12 |
EP1858659A1 (en) | 2007-11-28 |
DE102005006795A1 (en) | 2006-08-24 |
WO2006084847A1 (en) | 2006-08-17 |
JP2008529800A (en) | 2008-08-07 |
JP5070064B2 (en) | 2012-11-07 |
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