JP-7855079-B2 - Strapping device with drag torque lock

JP7855079B2JP 7855079 B2JP7855079 B2JP 7855079B2JP-7855079-B2

Inventors

ハプシュミット，ベンヤミン
フィッシュバッハ，ヤニック

Assignees

シグノードインダストリアルグループリミティドライアビリティカンパニー

Dates

Publication Date: 20260507
Application Date: 20230208
Priority Date: 20220216

Claims (16)

A strapping device, A tensioning assembly comprising a tensioning assembly gear mechanism operably connected to a tensioning wheel and rotating the tensioning wheel, Sealing assembly including gear mechanism, A motor operably connected to a drive gear, which drives the drive gear in a first rotational direction and a second rotational direction opposite to the first rotational direction, A transmission assembly is provided, and the transmission assembly is The drive gear is operably connected to a tension-applying assembly gear device, and the rotation of the drive gear in a first rotational direction drives the tension-applying assembly gear device, causing the tension-applying wheel to rotate in the tension-applying rotational direction. The drive gear is operably connected to a sealing assembly gear device, and the device comprises a second gear device in which the rotation of the drive gear in a second rotational direction drives the sealing assembly gear device. Furthermore, the system includes a locking assembly that engages with the second gear unit to prevent the second gear unit from driving the sealing assembly gear unit when the motor drives the drive gear in the first rotational direction, The second gear device comprises a sealing assembly drive shaft that is operably connected to the sealing assembly gear device and drives the sealing assembly gear device. The locking assembly is operably connected to the sealing assembly drive shaft to prevent the sealing assembly drive shaft from driving the sealing assembly gear device when the motor is driving the drive gear in the first rotational direction . The sealing assembly drive shaft comprises a sealing assembly drive gear that drives the driven gear of the sealing assembly gear device, wherein the sealing assembly drive shaft is equipped with a sealing assembly drive gear that drives the driven gear of the sealing assembly gear device.
The strapping device according to claim 1 , wherein the locking assembly is attached to the sealing assembly drive shaft and comprises a locking assembly freewheel that enables the sealing assembly drive shaft to rotate in a sealing rotation direction opposite to the tension-applying rotation direction.
The strapping device according to claim 2, wherein the locking assembly further comprises a locking ring attached to the locking assembly freewheel, the locking ring being mounted within a support and fixed rotatably with respect to the support to prevent the sealing assembly drive shaft from rotating in the tension-applying rotation direction and driving the sealing assembly gear device when the motor is driving the drive gear in a first rotation direction.
The strapping device according to claim 3 , further comprising a locking ring holder that engages with the locking ring and fixes the locking ring to the support in a rotational direction.
The strapping device according to claim 4 , wherein the locking ring holder is mounted within the support.
The strapping device according to claim 5 , wherein the locking ring holder is removable from the support.
The strapping device according to claim 5 , wherein the support comprises a tension-applying assembly support portion to which the tension-applying assembly is attached.
The strapping device according to claim 4, wherein the locking ring defines a number of circumferentially spaced openings passing through the locking ring, and a part of the locking ring holder protrudes into one of the openings and rotates relative to the support to fix the locking ring.
The strapping device according to claim 8, wherein the locking ring holder comprises a main body, a nose portion that is receptively received in a hole defined within the main body, and a nose portion biasing element that biases the nose portion toward the opening end of the hole, such that a portion of the nose portion protrudes from the opening end of the hole into one of the openings of the locking ring.
The strapping device according to claim 9, wherein the nose biasing element has sufficient rigidity to allow the sealing assembly drive shaft and the locking ring to rotate relative to the locking ring holder in the tension-applying rotation direction in response to the application of a torque in the tension-applying rotation direction that exceeds the resistance force applied by the nose biasing element.
The tensioning assembly includes a driven shaft operably connected to the tensioning wheel to drive the tensioning wheel, The strapping device according to claim 3, wherein the first gear device includes a first freewheel attached to the driven shaft and a first driven gear attached to the freewheel, the drive gear being drivably engaged with the first driven gear, the first driven gear being operably connected to the second gear device, and the first freewheel being configured to transmit the rotation of the first driven gear in the tension-applying rotation direction to the driven shaft, but not to transmit the rotation of the first driven gear in the sealing rotation direction to the driven shaft.
The second gear device further comprises a second freewheel attached to the sealing assembly drive shaft and a second driven gear attached to the second freewheel, wherein the first driven gear is operably connected to the second driven gear to drive the second driven gear. The strapping device according to claim 11, wherein the second freewheel is configured to transmit the rotation of the second driven gear in the sealing rotation direction to the sealing assembly drive shaft, but not to transmit the rotation of the second driven gear in the tensioning rotation direction to the sealing assembly drive shaft .
The strapping device according to claim 12 , further comprising a connector that operably connects the first driven gear to the second driven gear.
The strapping device according to claim 13, wherein the first gear device further comprises a drive gear of a second gear device fixed in the rotational direction to the first driven gear, and the connector operably connects the drive gear of the second gear device to the second driven gear.
The strapping device according to claim 13 , wherein the connector comprises a toothed belt.
The strapping device according to claim 1, wherein the transmission assembly further comprises the locking assembly.

Description

Priority Claim: This patent application claims priority and interest in U.S. Provisional Patent Application No. 63/268,084, filed on 16 February 2022, which is incorporated herein by reference in its entirety. This invention relates to a strapping device, and more particularly, to a strapping device configured to pull a strap around a load and attach the overlapping portions of the straps to each other to form a taut strap loop around the load. A strapping device is configured to pull a strap around a load, attaching the overlapping portions of the straps to each other to form a stretched strap loop around the load. A battery-powered strapping tool is one type of strapping device. To form a taut strap loop around a load using one of these strapping tools, the operator first pulls the end of the strap from the strap feeder, wraps the strap around the load, and positions the end of the strap under another portion of the strap. Next, the operator introduces one or more of these overlapping strap portions (depending on the type of strapping tool) into the strapping tool and activates one or more buttons to initiate a tensioning cycle in which (1) the tensioning assembly pulls the strap around the load, and (2) after the tensioning cycle is complete, the sealing assembly attaches the overlapping strap portions to each other (thus forming a taut strap loop around the load), and the detaching assembly cuts the strap from the strap feeder to initiate a sealing cycle. The method by which a strapping tool attaches overlapping portions of straps to each other during the sealing cycle depends on the type of strapping tool and the type of strap. Specific strapping tools configured for plastic straps (e.g., polypropylene or polyester straps) include friction welding machines, heated blades, or ultrasonic welding machines for attaching overlapping portions of the straps to each other. Some strapping tools configured for plastic or metal straps (e.g., steel straps) include jaws that mechanically deform (referred to as "crimping" in the strapping industry) or cut (referred to as "cutting" in the strapping industry) notches into a sealing element positioned around the overlapping portion of the strap to attach the overlapping portions of the straps to each other. Other strapping tools configured for metal straps include punches and dies configured to form a set of mechanically interlocking notches on the overlapping portions of the straps to attach the overlapping portions of the straps to each other (referred to as "sealless" attachment in the strapping industry). Operators of hand-held strapping tools use them hundreds of times a day, creating a continuous need to make the tools as light as possible (without sacrificing performance). One way to achieve this is to incorporate freewheels into the strapping tool's transmission. These freewheels allow a single motor to rotate the output shaft in different directions, driving different assemblies. One drawback is that freewheels can impose drag torque, potentially causing components of the transmission to rotate unintentionally, resulting in unintended driving (or reverse driving) of various assemblies. This can disrupt the strapping cycle. This is a perspective view of one exemplary embodiment of the strapping tool of the present disclosure.This is a perspective view of one exemplary embodiment of the strapping tool of the present disclosure.Figures 1A and 1B are block diagrams of specific components of the strapping tool.Figures 1A and 1B show schematic diagrams of the strapping tools used to secure cargo to pallets.Figures 1A and 1B show schematic diagrams of the strapping tools used to secure cargo to pallets.Figures 1A and 1B show schematic diagrams of the strapping tools used to secure cargo to pallets.This is a perspective view of a seal-less joint formed by the strapping tool shown in Figure 1A for attaching two overlapping portions of a strap.Figures 1A and 1B are perspective views of the working assembly of the strapping tool.Figures 1A and 1B are perspective views of the working assembly of the strapping tool.Figures 3A and 3B are partial side views of the working assembly, showing the upper and lower strap portions extending between the die assembly and the support of the sealing assembly, and between the tensioning wheel and the support.Figures 1A and 1B are partial side views of the strapping tool, where a portion of the front housing has been removed and the tensioning assembly is in the strap tensioning position.This is a partial side view similar to Figure 4A, but the tension-applying assembly is located at the strap insertion position.Figures 3A and 3B are perspective views of the tensioning assembly gear and tensioning wheel of the working assembly tensioning assembly.This is a cross-sectional perspective view of the tension-applying assembly gear device and tension-applying wheel of Figure 5A, broken along the line 5B-5B in Figure 5A.Figure 5A is an exploded