A shock absorber processing buffer block press fitting equipment

Abstract

The present application relates to the technical fields of buffer block press mounting, and discloses a buffer block press mounting equipment for shock absorber processing, which comprises a base, a support tooling table and a mounting frame are installed on the surface of the base, a first hydraulic rod is installed on the top of the mounting frame, a lifting frame is installed on the bottom telescopic end of the first hydraulic rod, a guide rod is installed on the lifting frame and is in sliding cooperation with the mounting frame, and a pressure head is installed on the bottom of the lifting frame and is aligned with the support tooling table; the present application can realize the predetermined positioning of the buffer block, automatic clamping, avoidance of the separable support seat and continuous and smooth completion of the press mounting process in one stroke of the pressure head, and the press mounting process is significantly simplified, the operation rhythm is shortened, and the overall press mounting efficiency is greatly improved; and the support positioning tooling is fixedly arranged on the processing table, the traditional movable base structure is cancelled, and the shaking and deviation problems caused by the reciprocating movement of the base are fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of buffer block pressing technology, specifically a buffer block pressing device for shock absorber processing. Background Technology

[0002] In the field of automotive shock absorber component assembly, the press-fitting of the buffer block and the support is a critical process. Existing technology includes press-fitting equipment that integrates the support fixture and the buffer block fixture with a movable base. By placing the buffer block and the support in the corresponding fixtures on the movable base, and then switching the workstations using the movable base, the press head can be aligned with the buffer block fixture and the support fixture in sequence. The press head first clamps the buffer block and then moves to the press-fitting station to complete the press-fitting operation.

[0003] While existing technologies include press-fitting equipment that integrates a support fixture and a buffer block fixture using a movable base, allowing for station switching via the movable base and sequential alignment of the press head with the two fixtures to complete the buffer block clamping and press-fitting operations, the movable base is prone to wobbling and offset during reciprocating motion. This leads to a decrease in the alignment accuracy between the buffer block and the support fixture, thereby affecting the coaxiality of the press-fitting. Furthermore, since both the buffer block and the support are pre-loaded onto their respective fixtures, the press head needs to press down sequentially to complete the clamping and press-fitting process. This is cumbersome and time-consuming, making it difficult to meet the demands of continuous and high-efficiency production.

[0004] To address this issue, those skilled in the art have proposed a buffer block pressing device for shock absorber processing, in order to solve the problems mentioned in the background above. Summary of the Invention

[0005] The purpose of this invention is to provide a buffer block pressing device for shock absorber processing, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A shock absorber buffer block pressing device includes a base, a support fixture and a mounting frame mounted on the surface of the base, a first hydraulic rod mounted on the top of the mounting frame, a lifting frame mounted on the bottom telescopic end of the first hydraulic rod, a guide rod slidably engaged with the mounting frame mounted on the lifting frame, and a pressing head aligned with the support fixture mounted on the bottom of the lifting frame. A fixed seat is mounted in the middle of the inner wall of the mounting frame, and two symmetrically distributed rotating rods are rotatably mounted on the fixed seat. A bracket is mounted on one end of the rotating rod extending to the outside of the fixed seat, and a detachable support seat aligned with the support fixture is mounted on the bracket for pre-positioning the buffer block. The device also includes:

[0008] The limiting component is set on both sides of the inner wall of the fixed seat. When the buffer block and the support are pressed, the limiting component limits and constrains the rotating rod, so that the separable support on the bracket remains in a closed combination state, thereby pre-positioning the buffer block and ensuring that the press head can align and center the buffer block in the separable support during the pressing process.

[0009] An adaptive triggering component is installed on the fixed seat and the lifting frame. When the pressure head completes the alignment and centering clamping of the buffer block inside the separable support seat, it can automatically release the limiting constraint on the rotating rod, so that the pressure head can drive the clamped buffer block to push down and open the separable support seat, and complete the pressing operation with the support on the support tooling table.

[0010] A reset assembly, which is disposed in the fixed base and connected to the rotating rod, is used to realize the reset rotation of the separable support base;

[0011] The ejector assembly is disposed between the support fixture and the base, and is used to eject the support and buffer block assembly upward after the press-fitting is completed.

[0012] As a preferred embodiment of the present invention, the support tooling table is provided with a support contour groove, a first positioning pin is provided in the middle of the support contour groove, a conical groove is provided in the pressure head, a second positioning pin is installed in the middle of the conical groove, and a plurality of elastic clips distributed in a ring are provided on the inner wall of the conical groove.

[0013] As a preferred embodiment of the present invention, the limiting component includes a limiting post installed at the end of the rotating rod and located in the fixed seat. Two sets of symmetrically distributed sliding grooves are provided on both sides of the inner wall of the fixed seat. A sliding frame that matches the arc surface of the limiting post is slidably arranged in the sliding groove. A slot is provided on the surface of the limiting post. A locking block that matches the slot is provided on the surface of the sliding frame. The sliding frame is connected to the inner wall of the fixed seat by a spring.

[0014] As a preferred embodiment of the present invention, the adaptive triggering component includes a connecting part and a driving part. The connecting part includes two symmetrically distributed conductive plates installed in the middle of the fixed base. An installation plate is installed at the end of the lifting frame. Conductive sliders that cooperate with the two conductive plates are installed on both sides of the installation plate. The driving part includes a back plate installed on both sides of the inner wall of the fixed base. An electromagnet and a fixed magnet are respectively provided near the back plate and the sliding frame.

[0015] As a preferred embodiment of the present invention, the reset assembly includes an inner cavity formed on both sides of the fixed base, a torsion spring connected to the inner cavity is provided at one end of the rotating rod that passes through the inner cavity, a lever is provided on the surface of the rotating rod, and a stop is provided on the inner wall of the inner cavity.

[0016] As a preferred embodiment of the present invention, the top two sides of the lifting frame are provided with separation rods.

[0017] As a preferred embodiment of the present invention, the top material assembly includes a bracket installed at the bottom of the base, a second hydraulic rod installed on the bracket, a top material frame installed at the telescopic end of the second hydraulic rod, and a plurality of top material rods that penetrate into the support tooling table installed on the top material frame.

[0018] The present invention has the following advantages: By setting a separable support base between the pressure head and the support fixture, the buffer block pre-placed in the separable support base can be aligned and centered during the downward pressing of the pressure head; after clamping, the adaptive trigger component drives the limit component to release the limit on the rotating rod, allowing the pressure head to push the separable support base downward through the clamped buffer block, thereby driving the buffer block to pass over the separable support base and the support in the support fixture to complete the pressing; the present invention can achieve buffer block pre-positioning, automatic clamping, and separable support in one stroke of the pressure head. The continuous and smooth completion of the support avoidance and pressing process eliminates the need for multiple reciprocating steps of the press head, significantly simplifying the pressing process, shortening the work cycle, and greatly improving the overall pressing efficiency. At the same time, the lightweight and separable support does not cause lateral interference to the clamping posture of the buffer block, further ensuring the stability and reliability of the pressing process. Furthermore, by fixing the support positioning fixture on the processing table, the traditional movable base structure is eliminated, fundamentally avoiding the shaking and offset problems caused by the reciprocating motion of the base. This effectively ensures the alignment accuracy and pressing coaxiality of the buffer block and the inner groove of the support, significantly improving assembly quality and product consistency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a shock absorber processing buffer block pressing equipment.

[0020] Figure 2 This is a schematic diagram of the pressure head in a shock absorber processing buffer block pressing equipment.

[0021] Figure 3 This is a schematic diagram of the support fixture table in a shock absorber processing buffer block press-fitting equipment.

[0022] Figure 4 This is a schematic diagram of the internal structure of the fixed seat in a shock absorber processing buffer block pressing equipment.

[0023] Figure 5 This is a schematic diagram of the structure of the limiting column and sliding frame in a shock absorber processing buffer block pressing equipment.

[0024] Figure 6 This is a schematic diagram of the limiting component in a shock absorber processing buffer block pressing equipment.

[0025] Figure 7 This is a schematic diagram of the top material assembly in a shock absorber processing buffer block pressing equipment.

[0026] In the diagram: 110, base; 120, support fixture; 121, support contour groove; 122, first locating pin; 130, mounting bracket; 140, first hydraulic rod; 150, lifting frame; 160, pressure head; 161, tapered groove; 162, elastic clamp; 163, second locating pin; 170, guide rod; 2, top material assembly; 210, top material rod; 220, top material frame; 230, second hydraulic rod; 240, bracket; 310, fixed seat; 320, rotating rod; 330 1. Bracket; 340. Separable support base; 4. Limiting assembly; 410. Limiting post; 420. Slide groove; 430. Sliding frame; 440. Spring; 450. Locking block; 460. Locking slot; 5. Adaptive triggering assembly; 510. Mounting plate; 520. Conductive slider; 530. Conductive plate; 540. Back plate; 550. Electromagnet; 560. Fixed magnet; 6. Reset assembly; 610. Inner cavity; 620. Torsion spring; 630. Toggle lever; 640. Stop block; 7. Separating rod. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0028] Please see Figures 1-7 A shock absorber processing buffer block pressing device includes a base 110, a support tooling table 120 and a mounting frame 130 mounted on the surface of the base 110. A first hydraulic rod 140 is mounted on the top of the mounting frame 130, and a lifting frame 150 is mounted on the bottom telescopic end of the first hydraulic rod 140. A guide rod 170 that slides with the mounting frame 130 is mounted on the lifting frame 150. A pressing head 160 aligned with the support tooling table 120 is mounted on the bottom of the lifting frame 150. A fixed seat 310 is mounted in the middle of the inner wall of the mounting frame 130. Two symmetrically distributed rotating rods 320 are rotatably mounted on the fixed seat 310. A bracket 330 is mounted on one end of each rotating rod 320 extending to the outside of the fixed seat 310. A separable support 340, aligned with the support tooling table 120, is mounted on the bracket 330 for pre-positioning the buffer block. The separable support 340 is made of lightweight material, effectively reducing its own weight and facilitating the smooth downward detachment of the buffer block as the pressure head 160 descends. The specific material and structure of the lightweight material are not limited, as long as they meet the requirements of this application. It also includes:

[0029] Limiting component 4 is disposed on both sides of the inner wall of the fixed base 310. When the buffer block and the support are pressed together, the limiting component 4 limits and constrains the rotating rod 320, so that the separable support 340 on the bracket 330 remains in a closed combination state, thereby pre-positioning the buffer block and ensuring that the pressing head 160 can align and center the buffer block in the separable support 340 during the pressing process.

[0030] The adaptive triggering component 5 is installed on the fixed base 310 and the lifting frame 150. When the pressure head 160 completes the alignment and centering clamping of the buffer block inside the separable support base 340, it can automatically release the limiting constraint on the rotating rod 320, so that the pressure head 160 can drive the clamped buffer block to push down and open the separable support base 340, and complete the pressing operation with the support on the support tooling table 120.

[0031] The reset component 6 is disposed in the fixed base 310 and connected to the rotating rod 320, and is used to realize the reset rotation of the separable support base 340;

[0032] The top material assembly 2 is disposed between the support tooling table 120 and the base 110, and is used to push the support and buffer block assembly upward after the pressing is completed.

[0033] In use, the buffer block is first placed in the closed separable support 340 to achieve pre-positioning of the buffer block. At the same time, the support is placed in the support fixture 120 for positioning and fixing. Then, the first hydraulic rod 140 is activated by the equipment controller. The first hydraulic rod 140 drives the lifting frame 150 to descend. The pressure head 160 descends synchronously with the lifting frame 150. During the downward pressing process of the pressure head 160, the buffer block pre-positioned in the separable support 340 can be aligned and centered. After clamping is completed, the adaptive trigger component 5 drives the limit component 4 to release the limit on the rotating rod 320, so that the pressure head 160 can push the separable support 340 downward through the clamped buffer block, thereby driving the buffer block to pass over the separable support 340 and the support in the support fixture 120 to complete the pressing work.

[0034] In one scenario of this embodiment, please refer to Figures 1-3 The support tooling table 120 is provided with a support contour groove 121, and a first positioning pin 122 is provided in the middle of the support contour groove 121. The pressure head 160 is provided with a conical groove 161, and a second positioning pin 163 is installed in the middle of the conical groove 161. The inner wall of the conical groove 161 is provided with a number of elastic clips 162 arranged in a ring.

[0035] The contour groove inside the support is used for high-precision radial and axial positioning of the support. The first positioning pin 122 is used to insert into the reference hole of the support to achieve unique fixation and correction of the support in the horizontal direction, ensuring that the support position is stable and without offset.

[0036] Correspondingly, the conical groove 161 inside the pressure head 160 gradually narrows from bottom to top, and its opening is flared to facilitate the smooth introduction of the buffer block. The second positioning pin 163 inside the conical groove 161 is used to cooperate with the center hole of the buffer block to achieve the center positioning of the buffer block. In conjunction with several elastic clips 162 inside the conical groove 161, the buffer block can be automatically centered and firmly clamped.

[0037] In one scenario of this embodiment, please refer to Figure 4 and Figure 5 The limiting component 4 includes a limiting post 410 installed at the end of the rotating rod 320 and located in the fixed base 310. Two sets of symmetrically distributed sliding grooves 420 are provided on both sides of the inner wall of the fixed base 310. A sliding frame 430 that cooperates with the arc-shaped surface of the limiting post 410 is slidably arranged in the sliding groove 420. A slot 460 is provided on the surface of the limiting post 410. A locking block 450 that cooperates with the slot 460 is provided on the surface of the sliding frame 430. The sliding frame 430 is connected to the inner wall of the fixed base 310 by a spring 440.

[0038] Under the elastic thrust of the spring 440, the sliding frame 430 is subjected to an elastic force towards the limiting post 410, which allows the locking block 450 on the surface of the sliding frame 430 to be stably locked into the slot 460. In this state, the rotating rod 320 is limited and cannot rotate, thereby keeping the separable support 340 on the bracket 330 in a closed state. After the separable support 340 is closed, its inner groove matches the shape of the buffer block, which can play a stable pre-positioning role for the buffer block, providing a guarantee for the accurate alignment and centering clamping of the buffer block during the downward movement of the pressure head 160, ensuring smooth clamping action and accurate positioning.

[0039] In one scenario of this embodiment, please refer to Figure 2 and Figure 4 The adaptive triggering component 5 includes a connecting part and a driving part. The connecting part includes two symmetrically distributed conductive plates 530 installed in the middle of the fixed base 310. An installation plate 510 is installed at the end of the lifting frame 150. Conductive sliders 520 that cooperate with the two conductive plates 530 are installed on both sides of the installation plate 510. The driving part includes a back plate 540 installed on both sides of the inner wall of the fixed base 310. An electromagnet 550 and a fixed magnet 560 are respectively provided near the back plate 540 and the sliding frame 430.

[0040] Electromagnet 550, conductive plate 530, conductive slider 520 and external power supply are electrically connected. When conductive slider 520 contacts conductive plate 530, the whole circuit is turned on. At this time, the coil of electromagnet 550 is connected to current. The current forms a magnetic field around the coil, which magnetizes the iron core and generates strong magnetism. In this state, the magnetism of electromagnet 550 and fixed magnet 560 near the same end is the same, thereby generating a repulsive force, driving sliding frame 430 to slide along slide groove 420 to the side away from limit post 410, thereby releasing the limit constraint on rotating rod 320.

[0041] Specifically, when the pressure head 160 completes the alignment and centering clamping of the pre-set buffer block on the separable support 340, the conductive slider 520 will contact the conductive plate 530. At this time, the circuit is turned on, the electromagnet 550 is energized and generates magnetism, thereby driving the sliding frame 430 to move along the slide groove 420, causing the locking block 450 on the sliding frame 430 to exit the locking groove 460 of the limiting post 410, thereby releasing the limiting constraint on the rotating rod 320, so that the buffer block after being aligned and centered by the pressure head 160 can push the separable support 340 downward to separate it. Then the buffer block crosses the separable support 340 and completes the pressing operation with the support in the support tooling table 120.

[0042] In one scenario of this embodiment, please refer to Figure 6 The reset assembly 6 includes an inner cavity 610 opened on both sides of the fixed base 310, a torsion spring 620 connected to the inner cavity 610 is provided at one end of the rotating rod 320 that passes through the inner cavity 610, a lever 630 is provided on the surface of the rotating rod 320, and a stop block 640 is provided on the inner wall of the inner cavity 610.

[0043] When the separable support 340 is in the closed state, the rotating rod 320 will be subjected to rotational torque under the torsion of the torsion spring 620, so that the lever 630 will always be pressed against the surface of the stop block 640, thereby ensuring that the separable support 340 can remain in the closed state after the limiting component 4 releases the limiting of the rotating rod 320, until it is pushed open downward by the buffer block.

[0044] When the pressing is completed and the pressure head 160 rises and resets, under the torque of the torsion spring 620, the rotating rod 320 drives the bracket 330 to rotate and reset, thereby driving the detachable support seat 340, which was pushed open, to rotate and reclose. At the same time, the limiting post 410 resets along with it, and its slot 460 and the locking block 450 are re-aligned. Under the elastic thrust of the spring 440, the sliding frame 430 drives the locking block 450 to re-lock into the slot 460 of the limiting post 410, thereby achieving a second limiting constraint on the rotating rod 320.

[0045] In one scenario of this embodiment, please refer to Figure 1 and Figure 2Separation rods 7 are provided on both sides of the top of the lifting frame 150.

[0046] During the pressing operation of the buffer block, as it pushes the separable support 340 downwards, the pressure head 160 needs to pass over the separable support 340. At this time, the separable support 340 will automatically rotate back to its original position under the torque of the torsion spring 620, thus interfering with the downward drive path of the pressure head 160 and affecting the smooth progress of the pressing operation. Therefore, a separation rod 7 is added to the top of the lifting frame 150 to limit the separable support 340 after it is pushed downwards, preventing it from resetting due to the action of the torsion spring 620 during the pressing process. This ensures that the separable support 340 always remains in a separated and avoidance state, providing interference-free space for the downward movement of the pressure head 160 and the pressing of the buffer block, and ensuring the stable and smooth completion of the pressing process.

[0047] In one scenario of this embodiment, please refer to Figure 3 and Figure 7 The top material assembly 2 includes a bracket 240 installed at the bottom of the base 110, a second hydraulic rod 230 installed on the bracket 240, a top material frame 220 installed at the telescopic end of the second hydraulic rod 230, and a plurality of top material rods 210 that penetrate into the support tooling table 120 installed on the top material frame 220.

[0048] After the press-fitting of the buffer block and the support is completed, the second hydraulic rod 230 is activated by the equipment controller. The second hydraulic rod 230 extends and drives the top material frame 220 to rise. The top material frame 220 drives the top material rod 210 above it to rise synchronously. The top material rod 210 pushes the support and buffer block assembly, which is stuck in the contour groove of the support tooling table 120, upwards. The assembly is then smoothly pushed out of the support tooling table 120, realizing automatic material discharge. This facilitates quick material removal by the operator and further improves the continuity and efficiency of the operation.

[0049] This invention enables the continuous and smooth completion of the buffer block pre-positioning, automatic clamping, detachable support 340 avoidance, and pressing processes in a single pressing stroke of the pressure head 160, eliminating the need for multiple reciprocating steps of the pressure head 160. This significantly simplifies the pressing process, shortens the work cycle, and greatly improves the overall pressing efficiency. At the same time, the lightweight detachable support 340 does not cause lateral interference to the clamping posture of the buffer block, further ensuring the stability and reliability of the pressing process. Furthermore, by fixing the support positioning fixture on the processing table, the traditional movable base structure is eliminated, fundamentally avoiding the shaking and offset problems caused by the reciprocating motion of the base. This effectively ensures the alignment accuracy and pressing coaxiality of the buffer block and the inner groove of the support, significantly improving assembly quality and product consistency.

[0050] The power supply and control of the electrical equipment in this application are all existing technologies and will not be elaborated upon here. The control of each component can be achieved using a PLC controller disclosed in the prior art, and the model and circuit connection of each component are not specifically limited. All electrical equipment involved are existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve improvements to the software and methods.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shock absorber processing buffer block pressing device, comprising a base, a support tooling table and a mounting frame mounted on the surface of the base, a first hydraulic rod mounted on the top of the mounting frame, a lifting frame mounted on the bottom telescopic end of the first hydraulic rod, a guide rod slidably engaged with the mounting frame mounted on the lifting frame, and a pressing head aligned with the support tooling table mounted on the bottom of the lifting frame, characterized in that, A fixed seat is installed in the middle of the inner wall of the mounting bracket. Two symmetrically distributed rotating rods are rotatably mounted on the fixed seat. A bracket is installed at one end of the rotating rods extending to the outside of the fixed seat. A detachable support seat, aligned with the support tooling table, is installed on the bracket for pre-positioning the buffer block. The mounting bracket also includes: The limiting component is set on both sides of the inner wall of the fixed seat. When the buffer block and the support are pressed, the limiting component limits and constrains the rotating rod, so that the separable support on the bracket remains in a closed combination state, thereby pre-positioning the buffer block and ensuring that the press head can align and center the buffer block in the separable support during the pressing process. An adaptive triggering component is installed on the fixed base and the lifting frame. When the pressure head completes the alignment and centering clamping of the buffer block inside the separable support, it can automatically release the limiting constraint on the rotating rod, so that the pressure head can drive the clamped buffer block to push down and open the separable support, and complete the pressing operation with the support on the support tooling table.

2. The shock absorber processing buffer block pressing equipment according to claim 1, characterized in that, The support tooling table is provided with a support contour groove, a first positioning pin is provided in the middle of the support contour groove, a conical groove is provided in the pressure head, a second positioning pin is installed in the middle of the conical groove, and a number of elastic clips distributed in a ring are provided on the inner wall of the conical groove.

3. The shock absorber processing buffer block pressing equipment according to claim 1, characterized in that, The limiting component includes a limiting post installed at the end of the rotating rod and located in the fixed seat. Two sets of symmetrically distributed sliding grooves are provided on both sides of the inner wall of the fixed seat. A sliding frame that matches the arc surface of the limiting post is slidably arranged in the sliding groove. A slot is provided on the surface of the limiting post. A locking block that matches the slot is provided on the surface of the sliding frame. The sliding frame is connected to the inner wall of the fixed seat by a spring.

4. The shock absorber processing buffer block pressing equipment according to claim 3, characterized in that, The adaptive triggering component includes a connecting part and a driving part. The connecting part includes two symmetrically distributed conductive plates installed in the middle of the fixed base. An installation plate is installed at the end of the lifting frame. Conductive sliders that cooperate with the two conductive plates are installed on both sides of the installation plate. The driving part includes a back plate installed on both sides of the inner wall of the fixed base. An electromagnet and a fixed magnet are respectively provided near the back plate and the sliding frame.

5. The shock absorber processing buffer block pressing equipment according to claim 4, characterized in that, Separation rods are provided on both sides of the top of the lifting frame.

6. The shock absorber processing buffer block pressing equipment according to claim 1, characterized in that, It also includes a reset assembly, which is disposed in the fixed base and connected to the rotating rod. The reset assembly includes an inner cavity opened on both sides of the fixed base, a torsion spring connected to the inner cavity is provided at one end of the rotating rod that passes through the inner cavity, a lever is provided on the surface of the rotating rod, and a stop is provided on the inner wall of the inner cavity.

7. The shock absorber processing buffer block pressing equipment according to claim 1, characterized in that, It also includes a top-feeding assembly, which is disposed between the support tooling table and the base. The top-feeding assembly includes a bracket installed at the bottom of the base, a second hydraulic rod installed on the bracket, a top-feeding frame installed at the telescopic end of the second hydraulic rod, and a plurality of top-feeding rods that penetrate into the support tooling table installed on the top-feeding frame.

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