Press safety bar structure for increasing productivity
The safety bar structure adjusts the lifting completion position and stroke distance based on product thickness, enhancing productivity and safety in press operations by optimizing cycle times and reducing the need for oversized lifting components.
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- NAMYANG MACHINERY MFG
- Filing Date
- 2023-04-20
- Publication Date
- 2026-07-15
AI Technical Summary
Conventional press devices face inefficiencies in productivity and economic efficiency due to the fixed large stroke distance of the upper press, which increases processing time and motor/cylinder capacity, regardless of the thickness of the gap between the upper and lower surfaces, and pose safety risks during maintenance and malfunctions.
A safety bar structure with adjustable safety bars and moving units that adjust the lifting completion position based on the thickness of the product, using cushioning springs to absorb impact and ensure safe operation, allowing for variable stroke distances and reduced cycle times.
Enhances productivity by optimizing stroke distance and cycle time, ensuring worker safety during maintenance, and reducing the need for oversized lifting devices, thus improving economic efficiency.
Smart Images
Figure 112023044526910-PAT00001_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a safety bar structure for a press for improving productivity, and more specifically, to a safety bar structure for a press for improving productivity with a novel configuration that lowers the press lifting completion position during a press operation to increase work productivity. Background Technology
[0003] Generally, when producing parts by press processing, the part is manufactured using a press mounted vertically on a press device. A press device is a compression processing machine that creates a product by applying force to a material, whether heated or unheated, to plastically deform it into a desired shape.
[0004] Conventional press devices are equipped with an upper press and a lower press, and produce an item by placing a material to be processed on the lower press and applying pressure with the upper press.
[0005] In this situation, the upper press descends toward the lower press to produce products via pressing actuation devices such as a pressing drive motor, cam, or pressing cylinder. However, if a malfunction occurs where the upper press fails to descend properly due to a power outage, improper hydraulic supply, or a sticking phenomenon, an operator may enter beneath the upper press to perform repair work. Meanwhile, when replacement of the upper or lower press is required, an operator may enter the space beneath the upper press while it is placed on top of the lower press to carry out the replacement.
[0006] Therefore, recently, it has been legally mandated to provide a safety bar that supports the upper press from below when it is raised from the lower press.
[0007] On the other hand, when press-forming a product with a relatively thicker gap between the upper and lower surfaces, the stroke distance of the upper press rising from the lower press must be increased; however, when press-forming a product with a relatively thinner gap between the upper and lower surfaces, it is advantageous in terms of productivity and economic efficiency to reduce the stroke distance without the need to increase the stroke distance of the upper press rising from the lower press.
[0008] However, conventionally, regardless of whether the thickness between the upper and lower surfaces is relatively thicker or thinner, the upper press takes a large stroke distance to move upward from the lower press, which presents disadvantages in terms of productivity and economic efficiency. As the stroke distance for lifting the upper press increases, the capacity of the pressing motor or hydraulic or pneumatic cylinder itself must increase proportionally to the stroke distance of the upper press, and since the product processing time increases as the stroke distance of the upper press increases, it can be said that there are losses in various aspects. Prior art literature
[0010] Korean Registered Patent No. 10-1631519 (Registered June 13, 2016) Korean Registered Patent No. 10-1979553 (Registered May 10, 2019) The problem to be solved
[0011] The objective of the present invention is to provide a safety bar structure for a press with a novel configuration for improving productivity, which lowers the press lifting completion position during press operation (production) to increase work productivity. The primary objective of the present invention is to provide a safety bar structure for a press that can expect various useful results, such as increased productivity through reduced cycle time, by lowering the press lifting completion position. means of solving the problem
[0013] According to the present invention, a safety bar structure for a press for improving productivity is provided, comprising: a support frame (120) positioned at a lower position of an upper press (23) of a press device and positioned outside the lifting area of the upper press (23); a safety bar moving unit (130) mounted on the support frame (120); and a safety bar (140) connected to the safety bar moving unit (130), which advances into the lifting area of the upper press (23) by the operation of the safety bar moving unit (130) when the upper press (23) of the press device is in a raised state, and retracts out to the outside of the lifting area of the upper press (23) by the operation of the safety bar moving unit (130) when the upper press (23) is lowered.
[0014] The above safety bar (140) is composed of at least two safety bars (140) with different lengths between their upper and lower ends, and the safety bar moving unit (130) is composed of at least two units, each configured to separately advance the safety bars (140) with different lengths between their upper and lower ends into the lifting area of the upper press (23) and to retract them outward from the lifting area of the upper press (23).
[0015] At least two of the above safety bar moving units (130) are characterized by being composed of a moving operating cylinder in which a cylinder rod is connected to at least two safety bars (140) with different lengths between their upper and lower ends.
[0016] At least two of the above safety bars (140) are configured such that a cushioning spring (SPR) is interposed between an upper bar member (UBM) and a lower bar member (LBM), and when the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the safety bar (140), the cushioning spring (SPR) is compressed and the upper bar member (UBM) descends to a certain height and performs a cushioning action, thereby preventing the impact force of the upper press (23) descending and colliding with the safety bar moving unit (130) from being applied. Effects of the invention
[0018] The present invention has the effect of increasing work productivity by lowering the press lifting completion position during press operations (production) using a press device. It enables increased work productivity by shortening the cycle time.
[0019] In addition, by operating the safety bar during mold replacement or equipment maintenance, it is possible to expect the effect of enabling the worker to easily perform maintenance inspections and ensuring the worker's safety. Brief explanation of the drawing
[0021] FIG. 1 is a front view schematically showing the structure of a safety bar moving unit and a safety bar, which are the main parts of a safety bar structure for a press for improving productivity according to the present invention. FIG. 2 is a front view showing the state in which the safety bar is advanced below the upper press of the press device by the operation of the safety bar moving unit shown in FIG. 1. FIG. 3 is a side view schematically showing the structure of a safety bar moving unit and a safety bar, which are the main parts of a safety bar structure for a press for improving productivity according to the present invention. FIG. 4 is a front view showing the structure of the lower safety bar illustrated in FIG. 3, FIG. 5 is a cross-sectional view showing the structure of the upper safety bar illustrated in FIG. 3, FIG. 6 is a front view showing a state in which the safety bar is retracted to the outer left and right positions of the upper press of the press device by the operation of the safety bar moving unit, which is a main part of the safety bar structure for a press for improving productivity according to the present invention. FIG. 7 is a front view showing the state in which the lower safety bar has advanced to the left and right bottom positions of the upper press of the press device by the operation of the safety bar moving unit illustrated in FIG. 6. FIG. 8 is a front view showing the lower safety bar illustrated in FIG. 7 in a state where it is retracted outward when the upper press is lowered. FIG. 9 is a front view showing the upper safety bar, which is a main part of the present invention, in a state where it has retracted outward from below the bottom surface of the upper press. FIG. 10 is a front view showing the upper safety bar (144) of FIG. 9 advanced below the bottom surface of the upper press. FIG. 11 is a plan view showing a state in which the safety bar is retracted to an outer position of the upper press of the press device by the operation of a safety bar moving unit, which is a main part of the safety bar structure for a press for improving productivity according to the present invention. FIG. 12 is a plan view showing the state in which the safety bar has advanced to the bottom position of the upper press of the press device by the operation of the safety bar moving unit shown in FIG. 11. FIG. 13 is a front view showing the state in which the upper press of the press device is raised to the height above the upper part of the upper safety bar, which is a main part of the safety bar structure for a press for productivity improvement according to the present invention, and the state in which the upper safety bar and the lower safety bar are retracted and removed outside the lifting area of the upper press. FIG. 14 is a front view showing the upper press rising above the upper safety bar and the upper safety bar and lower safety bar, which are the main parts, advancing to the bottom position of the upper press for maintenance or repair of the press device using the safety bar structure for press for productivity improvement according to the present invention. Specific details for implementing the invention
[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The objectives, features, and advantages of the present invention will be more easily understood by referring to the attached drawings and the following detailed description. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description is omitted.
[0023] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.
[0024] Furthermore, specific structural or functional descriptions in the present invention are illustrative of embodiments according to the concept of the present invention merely for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application.
[0026] FIG. 1 is a front view schematically showing the structure of a safety bar moving unit and a safety bar, which are the main parts of a safety bar structure for a press for improving productivity according to the present invention; FIG. 2 is a front view showing the state in which the safety bar is advanced below the upper press of the press device by the operation of the safety bar moving unit shown in FIG. 1; FIG. 3 is a side view schematically showing the structure of a safety bar moving unit and a safety bar, which are the main parts of a safety bar structure for a press for improving productivity according to the present invention; FIG. 4 is a front view showing the structure of a lower safety bar shown in FIG. 3; FIG. 5 is a cross-sectional view showing the structure of an upper safety bar (144) shown in FIG. 3; FIG. 6 is a front view showing the state in which the safety bar is retracted to the outer positions on both the left and right sides of the upper press of the press device by the operation of the safety bar moving unit, which is the main part of a safety bar structure for a press for improving productivity according to the present invention; FIG. 7 is a front view showing the state in which the lower safety bar is advanced to the bottom positions on both the left and right sides of the upper press of the press device by the operation of the safety bar moving unit shown in FIG. 6; FIG. 8 is FIG. 7 A front view showing the lower safety bar in a state where it is retracted outward when the upper press is lowered; FIG. 9 is a front view showing the upper safety bar, which is a main part of the present invention, in a state where it is retracted outward from below the bottom surface of the upper press; FIG. 10 is a front view showing the upper safety bar of FIG. 9 in a state where it is advanced below the bottom surface of the upper press; FIG. 11 is a plan view showing the safety bar in a state where it is retracted to an outer position of the upper press of the press device by the operation of the safety bar moving unit, which is a main part of the safety bar structure for a press for productivity improvement according to the present invention; FIG. 12 is a plan view showing the safety bar in a state where it is advanced to the bottom position of the upper press of the press device by the operation of the safety bar moving unit shown in FIG. 11.FIG. 13 is a front view showing the upper press of a press device raised to the height above the upper part of the upper safety bar, which is a main part of the safety bar structure for a press for productivity improvement according to the present invention, and the upper safety bar and the lower safety bar retracted and removed outside the lifting area of the upper press. FIG. 14 is a front view showing the upper press raised above the upper safety bar and the upper safety bar and the lower safety bar, which are main parts, advanced to the bottom position of the upper press for maintenance or repair of the press device using the safety bar structure for a press for productivity improvement according to the present invention.
[0027] Referring to the drawings, the safety bar structure for a press for improving productivity according to the present invention includes a support frame (120), a safety bar moving unit (130), and a safety bar (140).
[0028] As illustrated in FIGS. 1 to 3 and FIGS. 6 and 7, the support frame (120) is positioned below the upper press (23) of the press device. The support frame (120) is positioned outside the lifting area of the upper press (23). The support frame (120) is positioned so that the bottom surface of the upper press (23) does not get caught when the upper press (23) is lowered. The support frame (120) is positioned in a vertical direction. The support frame (120) is positioned on both the left and right sides of the press device.
[0029] Referring to FIGS. 1 and 2, the safety bar moving unit (130) is mounted on the support frame (120). The safety bar moving unit (130) is mounted on the support frame (120) at two locations, left and right, using fastening means such as brackets and bolts.
[0030] The safety bar (140) is connected to the safety bar moving unit (130). As shown in FIGS. 7 and FIGS. 10, when the upper press (23) of the press device is in a raised state, the safety bar (140) moves forward horizontally into the lifting area of the upper press (23) by the operation of the safety bar moving unit (130). As shown in FIGS. 6 and FIGS. 8, when the upper press (23) is lowered, the safety bar (140) moves horizontally outward from the lifting area of the upper press (23) by the operation of the safety bar moving unit (130). When the bottom surface of the upper press (23) approaches the safety bar (140), the safety bar (140) moves horizontally outward from the lifting area of the upper press (23) by the operation of the safety bar moving unit (130), thereby preventing the upper press (23) from getting caught on the safety bar (140) and being unable to lower.
[0031] FIG. 7 shows the state in which the lower safety bar is advanced below the bottom surface of the upper press (23), and FIG. 10 shows the state in which the upper safety bar (144) is advanced below the bottom surface of the upper press (23). When the press device is operating normally and the upper press (23) is raised only to the height above the upper part of the lower safety bar, the upper safety bar (144) remains in a retracted state. However, when the upper press (23) continues to descend, the lower safety bar is retracted so as to move away from the bottom position of the upper press (23) so as not to catch on the bottom surface of the upper press (23). When performing maintenance or repair work on the press device, the upper press (23) is raised further to the height above the upper part of the upper safety bar (144), and the upper safety bar (144) and the lower safety bar advance together to the bottom position of the upper press (23).
[0032] In the present invention, the safety bar (140) is composed of at least two safety bars (140) with different lengths between their upper and lower ends, as illustrated in FIGS. 1 to 5. In the present invention, an upper safety bar (144) positioned at the top and a lower safety bar (142) positioned below the upper safety bar (144), with a length between its upper and lower ends that is relatively longer than the length between its upper and lower ends of the upper safety bar (144), are illustrated. The safety bar (140) may be provided in two or more units. The upper safety bar (144) and the lower safety bar (142) are positioned in a vertical direction.
[0033] The above safety bar moving unit (130) is composed of at least two or more. The safety bars (140), each having a different length between the upper and lower ends, are configured to separately enter the lifting area of the upper press (23) and retract outward from the lifting area of the upper press (23).
[0034] In the present invention, at least two safety bar moving units (130) are composed of moving operating cylinders with cylinder rods connected to at least two safety bars (140), each having a different length between the upper and lower ends. As illustrated in FIGS. 1, 2, 7, and 8, the safety bar moving unit (130) is composed of an upper moving operating cylinder (134) and a lower moving operating cylinder (132). The cylinder rod of the upper moving operating cylinder (134) is connected to the upper safety bar (144), and the cylinder rod of the lower moving operating cylinder (132) is connected to the lower safety bar (142).
[0035] In addition, in the present invention, at least two safety bars (140) are configured such that a cushioning spring (SPR) is interposed between an upper bar member (UBM) and a lower bar member (LBM). When the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the safety bar (140), the cushioning spring (SPR) is compressed, and the upper bar member (UBM) descends to a certain height while performing a cushioning action, thereby preventing the impact force of the upper press (23) descending and colliding with the safety bar moving unit (130) from being applied.
[0036] Specifically, as illustrated in FIG. 4, the present invention is configured such that a cushioning spring (SPR) is interposed between an upper bar member (UBM) and a lower bar member (LBM). When the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the lower safety bar (142), the cushioning spring (SPR) is compressed, causing the upper bar member (UBM) to descend to a certain height and provide cushioning, thereby preventing impact force from being applied to the lower moving operating cylinder (132). Additionally, as illustrated in FIG. 5, the upper safety bar (144) is also configured such that a cushioning spring (SPR) is interposed between an upper bar member (UBM) and a lower bar member (LBM). When the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the upper safety bar (144), the cushioning spring (SPR) is compressed, causing the upper bar member (UBM) to descend to a certain height and provide cushioning. By acting, it prevents the application of an impact force to the upper moving operating cylinder (134). The upper safety bar (144) and the lower safety bar (142) are configured such that the upper bar member (UBM) and the lower bar member (LBM) are respectively connected to the upper and lower ends of the bar sleeve (BSL), and a cushioning spring (SPR) embedded in the bar sleeve (BSL) is interposed between the upper bar member (UBM) and the lower bar member (LBM) to provide a cushioning effect.
[0037] In the present invention, the cylinder rod of the upper moving operating cylinder (134) is connected to the side of the bar sleeve (BSL) of the upper safety bar (144), and the cylinder rod of the lower moving operating cylinder (132) is connected to the side of the bar sleeve (BSL) of the lower safety bar (142).
[0038] In the present invention, the cylinder rod of the upper moving operating cylinder (134) is arranged in a horizontal direction, and the upper safety bar (144) is connected to the cylinder rod of the upper moving operating cylinder (134) (i.e., the bar sleeve (BSL) is connected). When the upper moving operating cylinder (134) moves forward, the upper safety bar (144) enters the lifting area of the upper press (23) of the press device, and when the cylinder rod of the upper moving operating cylinder (134) moves backward, the upper safety bar (144) moves outward from the lifting area of the upper press (23).
[0039] Additionally, the cylinder rod of the lower moving operating cylinder (132) is positioned horizontally, and the lower safety bar (142) is connected to the cylinder rod of the lower moving operating cylinder (132) (i.e., the lower safety bar sleeve (BSL) is connected). When the lower moving operating cylinder (132) moves forward, the lower safety bar (142) enters the lifting area of the upper press (23) of the press device, and when the cylinder rod of the lower moving operating cylinder (132) moves backward, the lower safety bar (142) exits the lifting area of the upper press (23) to the outside. The lower safety bar (142) is operated to move forward into the lifting area of the upper press (23) or exit the lifting area of the upper press (23) from below the upper safety bar (144).
[0040] According to the present invention with the above-described configuration, when there is a need for the upper press (23) of the press device to rise high, such as when the thickness between the upper and lower surfaces of a product to be processed placed on the lower press of the press device is relatively thick (for example, when the height of the upper surface of the product to be processed placed on the lower press of the press device is higher than the upper end of the upper safety bar (144)), the upper safety bar (144) and the lower safety bar (142) are removed from the lifting area of the upper press (23) in advance, and as shown in FIGS. 9, 10, and 13, the height to which the upper press (23) of the press device rises increases, and as shown in FIGS. 6 and 7, when the upper press (23) is in a high state, the upper safety bar (144) enters the lifting area of the upper press (23), and then the upper press (23) descends to a distance close to the upper end of the upper safety bar (144) (for example, when the bottom surface of the upper press (23) is the upper When it comes down to a distance of up to 3mm from the top of the safety bar (144), the cylinder rod of the upper moving operating cylinder (134) moves backward so that the upper safety bar (144) moves outward from the lifting area of the upper press (23), and at the same time, the cylinder rod of the lower moving operating cylinder (132) moves backward so that the lower safety bar (142) also moves outward from the lifting area of the upper press (23) together with the upper safety bar (144), so that the upper press (23) of the press device continues to descend toward the lower press so that a product with a large height between the upper and lower surfaces is press processed.
[0041] Meanwhile, when the thickness between the upper and lower surfaces of the workpiece placed on the lower press of the press device is relatively thin (for example, when the height of the upper surface of the workpiece placed on the lower press of the press device is lower than or equal to the upper end of the lower safety bar (142)), there is no need for the upper press (23) of the press device to rise high. Therefore, as shown in FIGS. 7 and 8, when the upper press (23) is raised relatively low, the upper safety bar (144) is removed from the lifting area of the upper press (23) in advance, and the height to which the upper press (23) of the press device rises becomes relatively smaller. In this state where the upper press (23) is raised relatively lower, the lower safety bar (142) enters the lifting area of the upper press (23), and then the upper press (23) descends until it reaches a distance close to the upper end of the lower safety bar (142) (for example, when the bottom surface of the upper press (23) is above the upper end of the lower safety bar (142)). When it comes down to a distance of up to 3mm, the cylinder rod of the lower moving operating cylinder (132) moves backward so that the lower safety bar (142) moves outward from the lifting area of the upper press (23), so that the upper press (23) of the press device continues to descend toward the lower press, thereby allowing the product with a relatively small height between the upper and lower surfaces to be press-processed.
[0042] In this way, the process of raising the upper press (23) of the press device, entering the upper safety bar (144) or lower safety bar (142) into the upper press (23) lifting area, and retracting outward from the upper press (23) lifting area of the upper safety bar (144) or lower safety bar (142) when the upper press (23) is lowered is repeated so that the press processing operation of the product to be processed is performed.
[0043] Meanwhile, if a malfunction of the press device occurs, such as a breakdown or a press stick phenomenon, while the upper press (23) is raised to a position higher than the upper part of the upper safety bar (144), as shown in FIG. 14, the upper safety bar (144) and the lower safety bar (142) move into the lifting area of the upper press (23) to switch the state so that the upper press (23) can be supported by the upper safety bar (144), and then a worker can enter the lifting area of the upper press (23) to perform repair or inspection work on the press device. In this way, the safety of the worker who enters the lifting area below the upper press (23) to work can be ensured.
[0044] Additionally, when the upper safety bar (144) and the lower safety bar (142) are retracted to a position outside the lifting area of the upper press (23) and the upper press (23) is raised to a position higher than the upper part of the lower safety bar (142), if a failure of the press device occurs, such as a malfunction or a press stick phenomenon, as shown in FIG. 7, the lower safety bar (142) moves into the lifting area of the upper press (23) and switches to a state where the lower safety bar (142) can support the upper press (23), and then allows a worker to enter the lifting area of the upper press (23) and perform repair or inspection work on the press device. In this way, the safety of the worker who enters the lifting area below the upper press (23) to work can be ensured.
[0045] Accordingly, the present invention allows the lower safety bar (142) to enter the lifting area of the upper press (23) when the upper press (23) of the press device does not need to be raised high, and allows the lower safety bar (142) to be removed from the lifting area of the upper press (23) when the upper press (23) is lowered, thereby ensuring that the stroke of the upper press (23) being raised does not need to be excessively large, thus improving the productivity of the press product. Additionally, since there is no need to make the capacity of the lifting device, such as the pressing cylinder or pressing drive motor, excessively large to raise the upper press (23), it also has an advantageous effect in terms of economy and work efficiency.
[0046] In addition, in the present invention, an upper cushioning spring (SPR) and a lower cushioning spring (SPR) are interposed between the upper safety bar (144) and the lower safety bar (142), respectively, so that when the upper press (23) comes down and the bottom surface of the upper press (23) hits the upper part of the upper safety bar (144) due to causes such as a malfunction, the upper cushioning spring (SPR) absorbs the impact force generated, thereby preventing the upper moving operating cylinder (134) that operates the upper safety bar (144) back and forth from being damaged by the impact force. Also, when the upper press (23) comes down and the bottom surface of the upper press (23) hits the upper part of the lower safety bar (142) due to causes such as a malfunction, the lower cushioning spring (SPR) absorbs the impact force generated, thereby preventing the lower moving operating cylinder (132) that operates the lower safety bar (142) back and forth from being damaged by the impact force.
[0047] In summary, the present invention has the effect of increasing work productivity by lowering the press lifting completion position during press operations (production) using a press device. It enables increased work productivity by shortening the cycle time.
[0048] In addition, when changing molds or maintaining equipment, the safety bar (140) is operated to allow the worker to easily perform maintenance inspections.
[0049] In addition, the safety bar (140) can be operated to ensure the safety of the worker during mold replacement or equipment maintenance.
[0050] The term "mold" as described in the present invention mainly refers to the upper press (23) and lower press of a press device, and the term "equipment" mainly refers to a press device.
[0052] Those skilled in the art will understand that the present invention is not limited to the embodiments described above, but that various modifications and variations are possible within the scope of not altering the essence of the invention.
[0053] Accordingly, the embodiments described above are provided to fully inform those skilled in the art of the scope of the invention and should be understood as illustrative in all respects and not restrictive, and the invention is defined only by the scope of the claims. Explanation of the symbols
[0055] 23. Upper Press 120. Support Frame 130. Safety bar moving unit 132. Lower moving operating cylinder 134. Upper moving operating cylinder 140. Safety bar 142. Lower safety bar 144. Upper safety bar UBM. Upper bar member LBM. Lower bar member SPR. Buffer Spring
Claims
Claim 1 A support frame (120) positioned at a lower position of the upper press (23) of the press device and positioned outside the lifting area of the upper press (23); a safety bar moving unit (130) mounted on the support frame (120); and a safety bar (140) connected to the safety bar moving unit (130), which advances into the lifting area of the upper press (23) by the operation of the safety bar moving unit (130) when the upper press (23) of the press device is in a raised state, and retracts out to the outside of the lifting area of the upper press (23) by the operation of the safety bar moving unit (130) when the upper press (23) is lowered; wherein the safety bar (140) is composed of at least two safety bars (140) with different lengths between their upper and lower ends, and the safety bar moving unit (130) is composed of at least two, and the safety bar (140) with different lengths between their upper and lower ends is each separately the upper The safety bar moving unit (130) is configured to enter the lifting area of the press (23) and to retract outward from the lifting area of the upper press (23), and at least two of the safety bar moving units (130) are moving operating cylinders with cylinder rods connected to at least two safety bars (140) having different lengths between the upper and lower ends;It is configured such that at least two of the above safety bars (140) are configured such that a cushioning spring (SPR) is interposed between an upper bar member (UBM) and a lower bar member (LBM), and when the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the safety bar (140), the cushioning spring (SPR) is compressed, causing the upper bar member (UBM) to descend to a certain height and provide a cushioning effect, thereby preventing the impact force of the upper press (23) descending and colliding with the safety bar moving unit (130) from being applied. Additionally, the lower safety bar (142) is configured such that a cushioning spring (SPR) is interposed between the upper bar member (UBM) and the lower bar member (LBM), and when the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the lower safety bar (142), the cushioning spring (SPR) is compressed, causing the upper bar member (UBM) to descend to a certain height By acting as a buffer while descending, it prevents impact force from being applied to the lower moving operating cylinder (132). The upper safety bar (144) is also configured such that a buffer spring (SPR) is interposed between the upper bar member (UBM) and the lower bar member (LBM). When the upper press (23) of the press device descends and collides with the upper bar member (UBM) of the upper safety bar (144), the buffer spring (SPR) is compressed, causing the upper bar member (UBM) to descend to a certain height and act as a buffer, thereby preventing impact force from being applied to the upper moving operating cylinder (134). The upper safety bar (144) and the lower safety bar (142) are respectively connected to the upper and lower ends of the bar sleeve (BSL), and the buffer spring (SPR) embedded in the bar sleeve (BSL) is interposed between the upper bar member (UBM) and the lower bar member (LBM) to provide buffering. A safety bar structure for a press for improving productivity, characterized by being configured to function. Claim 2 delete Claim 3 delete Claim 4 delete