Bag-in-bag clamping mechanism

Abstract

The utility model provides a kind of bag clamping mechanism of bag entry, including mounting plate and two clamping units;Clamping unit clamping unit includes clamping arm, clamping arm pin, two release clamping crank, release clamping roller, connecting rod pin, connecting rod, movable clamping palm connecting rod pin, movable clamping palm, movable clamping palm clamping arm pin, clamping tension spring and fixed clamping palm;Clamping arm is fixed on the side of mounting plate before and after, and clamping arm, release clamping crank, connecting rod and movable clamping palm constitute plane hinge four-bar mechanism;Clamping tension spring pulls round clamping arm and connecting rod to make movable clamping palm can be closed with fixed clamping palm and clamps one side of plastic bag, when release clamping roller is pushed forward by external force greater than the tension of clamping tension spring, it can pull apart clamping arm and connecting rod to make movable clamping palm and fixed clamping palm open and release one side of plastic bag, and two clamping units left and right clamping two sides of plastic bag.

Description

Technical Field

[0001] This utility model belongs to the field of packaging equipment technology, and in particular relates to a bag clamping mechanism for inserting plastic bags. Background Technology

[0002] A leg pocket connector, with dimensions of Φ14.5×47(mm), smaller than a thumb and weighing 6g, is used in disposable drainage bags and belongs to the field of medical devices. The manufacturer uses a pull-tab transparent PE bag for packaging, with bag dimensions of 80×147(mm), and each bag contains 5 or 10 units.

[0003] Currently, leg pocket connectors are packaged manually, which suffers from low efficiency and pollution. To address this, we have developed an automatic packaging machine for leg pocket connectors, automating the packaging process.

[0004] To address this, we have developed a plastic bag clamping mechanism for clamping plastic bags with the bag opening facing upwards. Utility Model Content

[0005] The purpose of this utility model is to provide a plastic bag clamping mechanism for clamping a plastic bag with the bag opening facing upwards. The plastic bag clamping mechanism includes a mounting plate and two clamping units; the mounting plate is used to fix to an external mechanism, and the two clamping units are respectively fixed on the left and right sides of the mounting plate for clamping the two sides of the plastic bag from the left and right sides;

[0006] The clamping unit includes a clamping arm, a clamping arm pin, two release cranks, a release roller, a connecting rod pin, a connecting rod, a movable clamping palm connecting rod pin, a movable clamping palm, a movable clamping palm clamping arm pin, a clamping tension spring, and a fixed clamping palm.

[0007] The clamping arm is fixed to the edge of the mounting plate in a front-to-back direction. Clamping arm pins pass through the clamping arm near the mounting plate. Two release cranks pass through the clamping arm pins on the upper and lower sides of the clamping arm, respectively. Release rollers are located on the inner ends of the release cranks above the clamping arm. Connecting rod pins pass through the outer ends of the two release cranks. The rear end of the connecting rod passes through the connecting rod pin between the two release cranks. The movable clamping hand connecting rod pin passes through the front end of the connecting rod. The outer end of the movable clamping hand passes through the upper and lower ends of the movable clamping hand connecting rod pin, located outside the front end of the connecting rod. The palm clamping arm pin passes through the front end of the clamping arm and the inside of the movable palm clamp. The two ends of the clamping spring are fixed to the front end of the clamping arm and the rear end of the connecting rod, respectively. The fixed palm clamp is fixed to the inside of the clamping arm. The clamping arm, the release crank, the connecting rod, and the movable palm clamp constitute a planar hinge four-bar linkage. The clamping spring pulls the clamping arm and the connecting rod together so that the movable palm clamps can close with the fixed palm clamping one side of the plastic bag. When the release roller is pushed forward by an external force greater than the tension of the clamping spring, it can pull the clamping arm and the connecting rod apart so that the movable palm clamps open with the fixed palm clamping one side of the plastic bag.

[0008] Furthermore, the bag clamping mechanism also includes a clamping slide block and a clamping tension spring, and the clamping unit also includes a support roller bracket and a support roller;

[0009] The slide rail of the clamping slide block is fixed to the mounting plate in the left and right directions. The rear end of the clamping arm of the clamping unit is fixed to the slider of the clamping slide block. The clamping tension spring is fixed between the rear ends of the two clamping arms of the two clamping units. The support roller bracket is fixed to the rear end of the clamping arm, and the support roller is fixed to the support roller bracket. The two support rollers of the two clamping units can move away under the push of external force, and pull the two clamping units apart along the slide rail of the clamping slide block to clamp the two sides of the plastic bag. The clamping tension spring can close the two clamping units after the external force is removed, so that the two sides of the plastic bag clamped by the two clamping units shrink together and open the bag mouth for feeding.

[0010] Furthermore, it also includes an auxiliary plate and a support assembly. The auxiliary plate is fixed to the lower middle part of the mounting plate in a front-back direction, and the support assembly is fixed to the front side of the auxiliary plate.

[0011] The support assembly includes a support slide block, a support bracket, a support compression spring, and a support slide hand, with the support slide hand having a support wedge finger located at the upper end;

[0012] The slide rail of the support slide block is vertically fixed on the front side of the auxiliary plate. The support support is fixed on the lower end of the front side of the auxiliary plate. The support slide hand is fixed on the slider of the support slide block. The support pressure spring is set between the support support and the support slide hand. Under the elastic force of the support pressure spring, the support wedge finger of the support slide hand rises and inserts between the two support rollers of the two clamping units, pushing the two support rollers away, thereby pulling the two clamping units apart along the slide rail of the clamping slide block to clamp the two sides of the plastic bag. Under the action of external force, the support slide hand can bring the support wedge finger down. Under the tension of the clamping spring, the two support rollers can approach each other, thereby closing the two clamping units and causing the two sides of the plastic bag clamped by the two clamping units to shrink and open the bag mouth for feeding.

[0013] Furthermore, it also includes a support adjustment assembly. The support skateboard also has a support skateboard shoulder located at the lower end. The support adjustment assembly includes a support adjustment support, a support depth adjustment screw seat, a support adjustment arm pin, a support adjustment arm, a support adjustment roller, and a support depth adjustment screw.

[0014] The support adjustment bracket is fixed to the large surface of the auxiliary plate, near the support slide shoulder. The support depth adjustment screw seat is fixed to the side of the support adjustment bracket. The support adjustment arm pin passes through the middle of the support adjustment bracket in a left-right direction. The support adjustment arm passes through the support adjustment bracket in a front-back direction and passes through the support adjustment arm pin. The front end of the support adjustment arm rests on the support slide shoulder. The support adjustment roller is set on the rear end of the support adjustment arm. The support depth adjustment screw passes through the support depth adjustment screw seat. The lower end of the support depth adjustment screw located inside the support adjustment bracket can abut against the upper side of the support adjustment arm located in front of the support adjustment arm pin. External force can push the support adjustment roller up, causing the front end of the support adjustment arm to descend, which in turn causes the support slide and support wedge finger to descend. The two support rollers are brought closer together under the tension of the clamping spring.

[0015] The beneficial effects of a plastic bag clamping mechanism are as follows:

[0016] The clamping unit's clamping arm, release crank, connecting rod, and movable clamping palm form a planar hinge four-bar linkage. The clamping spring pulls the clamping arm and connecting rod together, allowing the movable clamping palm to close with the fixed clamping palm to clamp one side of the plastic bag. When the release roller is pushed forward by an external force greater than the tension of the clamping spring, it can pull the clamping arm and connecting rod apart, allowing the movable clamping palm to open with the fixed clamping palm and release one side of the plastic bag. The two clamping units clamp the two sides of the plastic bag from the left and right. Attached Figure Description

[0017] Figure 1 Structural diagram of the plastic bag insertion and clamping mechanism.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1400, Bag clamping mechanism; 1410, Mounting plate; 1420, Clamping slide block; 1430, Clamping unit; 1440, Clamping tension spring; 1450, Auxiliary plate; 1460, Support assembly; 1470, Support adjustment assembly;

[0020] 1430. Clamping unit; 1431. Clamping arm; 1432. Clamping arm pin; 1433. Release crank; 1434. Release roller; 1435. Connecting rod pin; 1436. Connecting rod; 1437. Movable clamping palm connecting rod pin; 1438. Movable clamping palm; 1439. Movable clamping palm clamping arm pin; 143B. Clamping tension spring; 143C. Fixed clamping palm; 143E. Support roller bracket; 143F. Support roller;

[0021] 1460. Support assembly; 1461. Support slide; 1462. Support bracket; 1463. Support compression spring; 1464. Support skater; 14641. Support wedge finger; 14642. Support skater shoulder slope;

[0022] 1470. Support and adjustment assembly; 1471. Support and adjustment bracket; 1472. Support depth adjustment screw seat; 1473. Support and adjustment arm pin; 1474. Support and adjustment arm; 1475. Support and adjustment roller; 1476. Support depth adjustment screw. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, used to refer to a fixed connection, as well as a detachable connection, or an integral connection; used to refer to a direct connection, as well as an indirect connection through an intermediate medium, and used to refer to the internal communication of two components. For those skilled in the art, the specific meaning of the terms in this utility model is understood according to the specific circumstances.

[0025] See Figure 1 This embodiment provides a plastic bag clamping mechanism 1400 for clamping a plastic bag with the bag opening facing upwards. It includes a mounting plate 1410 and two clamping units 1430. The mounting plate 1410 is fixed to an external mechanism, and the two clamping units 1430 are respectively fixed on the left and right sides of the mounting plate 1410 for clamping the two sides of the plastic bag from the left and right.

[0026] The clamping unit 1430 includes a clamping arm 1431, a clamping arm pin 1432, two release cranks 1433, a release roller 1434, a connecting rod pin 1435, a connecting rod 1436, a movable clamping palm connecting rod pin 1437, a movable clamping palm 1438, a movable clamping palm clamping arm pin 1439, a clamping tension spring 143B, and a fixed clamping palm 143C.

[0027] The clamping arm 1431 is fixed to the side of the mounting plate 1410 in a front-to-back direction. The clamping arm pin 1432 passes through the clamping arm 1431 near the mounting plate 1410. Two release cranks 1433 are respectively passed through the clamping arm pin 1432 and located on the upper and lower sides of the clamping arm 1431. The release roller 1434 is located on the inner end of the release crank 1433 and above the clamping arm 1431. The connecting rod pin 1435 passes through the outer ends of the two release cranks 1433. The rear end of the connecting rod 1436 passes through the connecting rod pin 1435 and is located between the two release cranks 1433. The movable clamping palm connecting rod pin 1437 passes through the front end of the connecting rod 1436. The outer part of the movable clamping palm 1438 passes through the upper and lower ends of the movable clamping palm connecting rod pin 1437 and is located outside the front end of the connecting rod 1436. The movable clamping palm clamping arm... Pin 1439 is inserted through the front end of clamping arm 1431 and through the inside of movable clamping palm 1438. The two ends of clamping spring 143B are fixed to the front end of clamping arm 1431 and the rear end of connecting rod 1436, respectively. Fixed clamping palm 143C is fixed to the inside of clamping arm 1431. Clamping arm 1431, release crank 1433, connecting rod 1436 and movable clamping palm 1438 constitute a planar hinge four-bar mechanism. Clamping spring 143B pulls clamping arm 1431 and connecting rod 1436 together so that movable clamping palm 1438 can close with fixed clamping palm 143C to clamp one side of the plastic bag. When the release roller 1434 is pushed forward by an external force greater than the tension of clamping spring 143B, it can pull open clamping arm 1431 and connecting rod 1436 so that movable clamping palm 1438 and fixed clamping palm 143C can open and release the plastic bag.

[0028] Further, see Figure 1 The bag clamping mechanism 1400 also includes a clamping slide block 1420 and a clamping tension spring 1440, and the clamping unit 1430 also includes a supporting roller bracket 143E and a supporting roller 143F.

[0029] The slide rail of the clamping slide block 1420 is fixed to the mounting plate 1410 in the left and right directions. The rear end of the clamping arm 1431 of the clamping unit 1430 is fixed to the slider of the clamping slide block 1420. The clamping tension spring 1440 is fixed between the rear ends of the two clamping arms 1431 of the two clamping units 1430. The support roller bracket 143E is fixed under the rear end of the clamping arm 1431, and the support roller 143F is fixed on the support roller bracket 143E. The two support rollers 143F of the two clamping units 1430 can move away under the push of external force, and pull the two clamping units 1430 apart along the slide rail of the clamping slide block 1420 to clamp the two sides of the plastic bag. The clamping tension spring 1440 can close the two clamping units 1430 after the external force is removed, so that the two sides of the plastic bag clamped by the two clamping units 1430 shrink and open the bag opening for feeding.

[0030] Furthermore, see Figure 1The bag clamping mechanism 1400 also includes an auxiliary plate 1450 and a support assembly 1460. The auxiliary plate 1450 is fixed to the lower part of the middle of the mounting plate 1410 in the front and rear directions, and the support assembly 1460 is fixed to the front side of the auxiliary plate 1450.

[0031] The support assembly 1460 includes a support slide 1461, a support support 1462, a support compression spring 1463, and a support slide 1464. The support slide 1464 is provided with a support wedge finger 14641 located at the upper end.

[0032] The slide rail of the support slide block 1461 is vertically fixed to the front side of the auxiliary plate 1450. The support support 1462 is fixed to the lower end of the front side of the auxiliary plate 1450. The support slider 1464 is fixed to the slider of the support slide block 1461. The support compression spring 1463 is disposed between the support support 1462 and the support slider 1464. Under the elastic force of the support compression spring 1463, the support wedge finger 14641 of the support slider 1464 rises and inserts into the two supports of the two clamping units 1430. Between the holding rollers 143F, push the two supporting rollers 143F away, thereby pulling the two clamping units 1430 apart along the slide rail of the clamping slide block 1420 to clamp the two sides of the plastic bag. Under the action of external force, the supporting slide 1464 can bring the supporting wedge finger 14641 down. Under the action of the clamping tension spring 1440, the two supporting rollers 143F can come closer together, thereby closing the two clamping units 1430, so that the two sides of the plastic bag clamped by the two clamping units 1430 shrink and open the bag mouth for feeding.

[0033] Furthermore, see Figure 1 The bag clamping mechanism 1400 also includes a support adjustment assembly 1470, and the support slide 1464 is also provided with a support slide shoulder 14642 located at the lower end. The support adjustment assembly 1470 includes a support adjustment support 1471, a support depth adjustment screw seat 1472, a support adjustment arm pin 1473, a support adjustment arm 1474, a support adjustment roller 1475, and a support depth adjustment screw 1476.

[0034] The support adjustment bracket 1471 is fixed to the large surface of the auxiliary plate 1450, near the support handle shoulder 14642. The support depth adjustment screw seat 1472 is fixed to the side of the support adjustment bracket 1471. The support adjustment arm pin 1473 is inserted horizontally through the middle of the support adjustment bracket 1471. The support adjustment arm 1474 is inserted front-back through the support adjustment bracket 1471 and outside the support adjustment arm pin 1473. The front end of the support adjustment arm 1474 rests on the support handle shoulder 14642. The support adjustment roller 1475 is set on the support adjustment arm 1474. At the rear end of 74, the support depth adjustment screw 1476 passes through the support depth adjustment screw seat 1472. The lower end of the support depth adjustment screw 1476 located inside the support adjustment support 1471 can abut against the upper side of the support adjustment arm 1474 located in front of the support adjustment arm pin 1473. External force can push the support adjustment roller 1475 to lower the front end of the support adjustment arm 1474, causing the support slide 1464 to lower with the support wedge finger 14641. The two support rollers 143F are brought closer together under the tension of the clamping spring 1440.

[0035] The specific implementation process is as follows:

[0036] Clamping and releasing the plastic bag 10: The clamping springs 143B of the two paired clamping units 1430 pull the movable clamping palm 1438 to clamp the two sides of the plastic bag 10 with the bag opening facing upward. When an external force pushes the two release rollers 1434 towards the plastic bag 10, the two clamping springs 143B can be stretched, causing the movable clamping palm 1438 to release the two sides of the plastic bag 10.

[0037] The lateral width setting of the clamping bag 10 and the opening of the clamped bag 10: The support depth adjustment screw 1476 presses down the support adjustment arm 1474 and the support slide shoulder 14642 of the support slide 1464, causing the support wedge finger 14641 to be inserted between the support rollers 143F of the two clamping units 1430 to a preset depth. External force pushes up the support adjustment roller 1475, causing the support adjustment arm 1474 to press down on the end away from the support adjustment roller 1475, which in turn drives the support slide shoulder 14642 of the support slide 1464 to lower the support wedge finger 14641, thereby inserting it into the two clamping units 1430. The depth between the two support rollers 143F of the holding unit 1430 decreases until the support wedge finger 14641 completely disengages from between the support rollers 143F. The distance between the two support rollers 143F decreases until it reaches zero under the tension of the clamping spring 1440. The distance between the two clamping arms 1431 decreases until it reaches its minimum. The two clamping arms 1431 of the two clamping units 1430 are opened to a preset distance, which can meet the clamping needs of plastic bags 10 of different widths. The two clamping units 1430 clamp the two sides of the plastic bag 10 and close them in the middle to open the bag opening of the plastic bag 10 for filling.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plastic bag clamping mechanism (1400) for clamping a plastic bag with the bag opening facing upwards, comprising a mounting plate (1410) and two clamping units (1430); the mounting plate (1410) is fixed to an external mechanism, and the two clamping units (1430) are respectively fixed to the left and right sides of the mounting plate (1410) for clamping the two sides of the plastic bag from the left and right, characterized in that: The clamping unit (1430) includes a clamping arm (1431), a clamping arm pin (1432), two release cranks (1433), a release roller (1434), a connecting rod pin (1435), a connecting rod (1436), a movable clamping palm connecting rod pin (1437), a movable clamping palm (1438), a movable clamping palm clamping arm pin (1439), a clamping tension spring (143B), and a fixed clamping palm (143C). The clamping arm (1431) is fixed to the side of the mounting plate (1410) in a front-to-back direction. The clamping arm pin (1432) passes through the clamping arm (1431) near the mounting plate (1410) from top to bottom. Two release cranks (1433) are respectively passed through the clamping arm pin (1432) and located on the upper and lower sides of the clamping arm (1431). The release roller (1434) is located on the inner end of the release crank (1433) above the clamping arm (1431). The connecting rod pin... (1435) is threaded through the outer ends of the two release cranks (1433), the rear end of the connecting rod (1436) is threaded through the connecting rod pin (1435) and located between the two release cranks (1433), the movable clamping arm connecting rod pin (1437) is threaded through the front end of the connecting rod (1436), the outer end of the movable clamping arm (1438) is threaded through the upper and lower ends of the movable clamping arm connecting rod pin (1437) and located outside the front end of the connecting rod (1436), the movable clamping arm pin (1438) is threaded through the connecting rod pin (1435) and located outside the front end of the connecting rod (1436), the movable clamping arm pin (1438) is threaded through the connecting rod pin (1435) and located between the two release cranks (1433), the movable clamping arm pin (1435 ... 439) The clamping spring (143B) is inserted through the front end of the clamping arm (1431) and through the inner part of the movable clamping palm (1438). The two ends of the clamping spring (143B) are respectively fixed to the lower front end of the clamping arm (1431) and the rear end of the connecting rod (1436). The fixed clamping palm (143C) is fixed to the inner side of the clamping arm (1431). The clamping arm (1431), the release crank (1433), the connecting rod (1436), and the movable clamping palm (1438) constitute a planar hinge. The lever mechanism includes a clamping spring (143B) that pulls the clamping arm (1431) and the connecting rod (1436) together, allowing the movable clamping palm (1438) to close with the fixed clamping palm (143C) to clamp one side of the plastic bag. When the release roller (1434) is pushed forward by an external force greater than the tension of the clamping spring (143B), it can pull open the clamping arm (1431) and the connecting rod (1436), allowing the movable clamping palm (1438) and the fixed clamping palm (143C) to open and release one side of the plastic bag.

2. The bag clamping mechanism (1400) according to claim 1 further includes a clamping slide block (1420) and a clamping tension spring (1440), and the clamping unit (1430) further includes a supporting roller bracket (143E) and a supporting roller (143F); The slide rail of the clamping slide block (1420) is fixed left and right under the mounting plate (1410). The rear end of the clamping arm (1431) of the clamping unit (1430) is fixed on the slider of the clamping slide block (1420). The clamping tension spring (1440) is fixed between the rear ends of the two clamping arms (1431) of the two clamping units (1430). The supporting roller bracket (143E) is fixed under the rear end of the clamping arm (1431). The supporting roller (143... F) Fixed on the support roller bracket (143E); the two support rollers (143F) of the two clamping units (1430) can move away under external force, and pull the two clamping units (1430) apart along the slide rail of the clamping slide block (1420) to clamp the two sides of the plastic bag. The clamping tension spring (1440) can close the two clamping units (1430) after the external force is removed, so that the two sides of the plastic bag clamped by the two clamping units (1430) shrink and open the bag mouth for feeding.

3. The bag clamping mechanism (1400) according to claim 2 further includes an auxiliary plate (1450) and a support assembly (1460), wherein the auxiliary plate (1450) is fixed in the front and rear direction to the lower part of the mounting plate (1410), and the support assembly (1460) is fixed to the front side of the auxiliary plate (1450); The support assembly (1460) includes a support slide (1461), a support base (1462), a support compression spring (1463), and a support slide (1464), wherein the support slide (1464) is provided with a support wedge finger (14641) located at the upper end; The slide rail of the support slide assembly (1461) is vertically fixed on the front side of the auxiliary plate (1450). The support support (1462) is fixed on the lower end of the front side of the auxiliary plate (1450). The support slider (1464) is fixed on the slider of the support slide assembly (1461). The support compression spring (1463) is disposed between the support support (1462) and the support slider (1464). The support wedge finger (14641) of the support slider (1464) rises and inserts into the two clamping units (143) under the elastic force of the support compression spring (1463). Between the two supporting rollers (143F) of 0), the two supporting rollers (143F) are pushed away, thereby pulling the two clamping units (1430) apart along the slide rail of the clamping slide block (1420) to clamp the two sides of the plastic bag. The supporting slide (1464) can bring the supporting wedge finger (14641) down under the action of external force. Under the pulling force of the clamping tension spring (1440), the two supporting rollers (143F) can come closer together, thereby closing the two clamping units (1430) so that the two sides of the plastic bag clamped by the two clamping units (1430) shrink and open the bag opening for feeding.

4. The bag clamping mechanism (1400) according to claim 3 further includes a support adjustment assembly (1470), wherein the support slide (1464) is further provided with a support slide shoulder (14642) located at the lower end, and the support adjustment assembly (1470) includes a support adjustment support (1471), a support depth adjustment screw seat (1472), a support adjustment arm pin (1473), a support adjustment arm (1474), a support adjustment roller (1475), and a support depth adjustment screw (1476); The support adjustment bracket (1471) is fixed to the large surface of the auxiliary plate (1450), near the support for the skater's shoulder (14642). The support depth adjustment screw seat (1472) is fixed to the side of the support adjustment bracket (1471). The support adjustment arm pin (1473) passes through the middle of the support adjustment bracket (1471) in a left-right direction. The support adjustment arm (1474) passes through the support adjustment bracket (1471) in a front-back direction and passes through the support adjustment arm pin (1473). The front end of the support adjustment arm (1474) rests on the support for the skater's shoulder (14642). The support adjustment roller (1475) is located on the support adjustment arm. At the rear end of (1474), the support depth adjustment screw (1476) passes through the support depth adjustment screw seat (1472). The lower end of the support depth adjustment screw (1476) located inside the support adjustment support (1471) can abut against the upper side of the support adjustment arm (1474) located in front of the support adjustment arm pin (1473). External force can push the support adjustment roller (1475) to lower the front end of the support adjustment arm (1474), causing the support slide (1464) to lower the support wedge finger (14641). The two support rollers (143F) are brought closer together under the tension of the clamping spring (1440).

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